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You Brake. Drivers Notice.

Cosari VeloPulse Pro

The VeloPulse Pro flares to a solid 120-lumen red the moment you slow down, ignores road buzz, and wakes itself.

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  • 120-lumen auto brake boost that ignores road chatter
  • Auto wake on movement, auto sleep when parked
  • IPX6 CNC aluminum body with sealed USB-C port
  • Saddle-rail and seatpost mounts both included
Cosari VeloPulse Pro
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Built for the Rider Behind the Saddle

Every detail came from the same complaints: lights that drooped, died, leaked, or flashed at nothing.

Active Brake Boost

Touch your levers and the lens jumps to a solid 120-lumen red for three seconds, so drivers know you're slowing before they close the gap.

Auto Sleep & Wake

Roll the bike and it turns on. Park it and it sleeps 120 seconds later. You'll forget where the power button is.

Sealed Aluminum Body

Machined 6061 aluminum with an IPX6 threaded O-ring seal over the USB-C port. No rubber flap for tire spray to get past.

Both Mounts Included

A low-profile saddle-rail bracket and a silicone strap for round or aero posts from 22 to 35mm. No measuring before you order.

How the VeloPulse Pro Works

It Reads Your Braking, Not the Road

It Reads Your Braking, Not the Road

A filtered 6-axis accelerometer tracks forward deceleration and ignores vertical vibration from chipseal and potholes. When you actually slow down, it surges to 120 lumens of solid red for three seconds.

It Fits the Bike You Already Have

It Fits the Bike You Already Have

Clamp it under standard 7mm saddle rails for a clean, tucked look, or strap it to a round or D-shaped aero seatpost. Both mounts use the same quarter-turn lock, so the light moves between them in seconds.

It Keeps Water Out for Good

It Keeps Water Out for Good

Unscrew the knurled tail cap to reach the USB-C port and battery gauge. A silicone O-ring seals the threads, so rear-wheel spray has no gap to work through.

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Excellent4.8 (247)Trustpilot

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Cosari VeloPulse Pro

CNC aluminum smart rear light with auto brake boost, auto sleep/wake, IPX6 sealed USB-C, and both saddle-rail and seatpost mounts in the box.

Backed by our 30-Day Money-Back Trial & Full 2-Year Cosari Warranty.

$24.99 $49.99 Free Tracked Shipping Included

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30-Day Money-Back Guarantee plus a full 2-Year Warranty.

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Description

Overview: The Cosari VeloPulse Pro is a 36g CNC aluminum rear light with an accelerometer brake boost, automatic sleep/wake, an IPX6 sealed USB-C port, and up to 45 hours of runtime. It's built for road, gravel and commuter riders who want a light that works without babysitting.

Modes: Smart Auto Mode handles wake, sleep and brake boost for you. Manual Constant Mode keeps things steady when you want them steady. A 60-lumen daytime flash, an eco pulse, and a low-glare breathing pulse for group rides round things out.

Charging: Unscrew the tail cap, plug in any USB-C cable, and it's full in about 90 minutes. The 4-LED gauge shows charge level whenever you press the button.

Shipping & 30-Day Returns

Free Shipping: Every order ships free with full tracking within 24 hours.

30-Day Trial: Try it at home for 30 days risk-free. Need help? Email us anytime at support@buycosari.com.

2-Year Warranty: If anything goes wrong within 2 years, we replace it free of charge or refund your order in full.

Why Choose the Cosari VeloPulse Pro?

Cosari VeloPulse Pro Detail

220° Wide-Angle Visibility

The faceted optical dome spreads light 220 degrees, so cross traffic at side streets and roundabouts sees you too, not just the car directly behind.

45 Hours Between Charges

A 500mAh cell runs up to 45 hours in eco-pulse mode, and the 4-LED gauge removes the guesswork before long rides.

Paceline-Friendly Modes

Switch to the gentle breathing pulse on group rides and save the full strobe for solo miles on busy roads.

Cosari VeloPulse Pro vs. Ordinary Alternatives

Cosari VeloPulse ProStandard Competitors

FeatureCosari VeloPulse ProStandard Competitors
Housing materialMachined 6061 aluminumInjection-molded plastic
Charging port sealThreaded O-ring, IPX6Press-in rubber flap
Brake detectionFiltered accelerometer, ignores road buzzBasic tilt switch or none
Mounts in the boxSaddle-rail and seatpostSingle strap or clip
Power managementAuto wake and auto sleepManual on/off only
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What's Included

In the Box
  • 1 × Cosari VeloPulse Pro CNC aluminum smart tail light
  • 1 × Under-saddle rail mount with bolts, mini hex key & 4 backup zip-ties
  • 1 × Silicone aero/round seatpost strap mount
  • 1 × USB-C charging cable
Technical Specifications
  • Light Output: 120 lm brake surge / 60 lm daytime flash
  • Visibility: Up to 1,000 m (0.62 mi), 220° wide-angle dome
  • Housing: 6061 CNC anodized aluminum
  • Weight & Size: 36 g, 34 mm diameter × 28 mm depth
  • Water Resistance: IPX6, threaded O-ring sealed port
  • Battery: 500 mAh Li-ion, up to 45 hrs (eco pulse), ~90 min charge via USB-C
  • Auto Sleep: 120 seconds after the bike stops moving
  • Mount Fit: 7×7 mm & 7×9 mm saddle rails, 22–35 mm round/aero seatposts
Care & Safety
  • After muddy or wet rides, rinse the housing with fresh water and wipe it dry. Keep the tail cap screwed fully closed while riding so the O-ring stays seated.
  • If the O-ring ever looks dry or dusty, wipe it clean before closing the cap. Store the light above freezing when charging, and top it up every few months if the bike sits unused.
  • Backed by our 30-Day Money-Back Guarantee & 2-Year Warranty
  • Customer Support: support@buycosari.com
In the Box Cosari VeloPulse Pro

Set Up in Under 60 Seconds

Swipe left for steps 2 and 3

  1. Clip the Mount On
    1

    Clip the Mount On

    Clamp the bracket under your saddle rails, or wrap the silicone strap around your seatpost. It takes about 30 seconds.

  2. Quarter-Turn to Lock
    2

    Quarter-Turn to Lock

    Push the light into the mount and twist 90 degrees until it clicks flush. No wobble, no droop.

  3. Roll Out and Ride
    3

    Roll Out and Ride

    Move the bike and the light wakes up on its own. Brake and it flares red. Park it and it goes back to sleep.

Verified Customer Reviews

What 200+ Verified Buyers Say About the Cosari VeloPulse Pro

Excellent Trustpilot
4.8
Based on 247 verified reviews
5 Stars
212
4 Stars
25
3 Stars
7
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1 Star
1
97% of buyers recommend the Cosari VeloPulse Pro
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✓ Verified Purchase
Mark T.3 days ago

Clean under-saddle mount and cars noticeably pass wider

Got buzzed way too close by an SUV in late-afternoon tree shadows last month and finally ditched my cheap plastic blinky. Tucked the VeloPulse Pro right under the saddle rails on my gravel bike—looks super clean and doesn't rub my bibs at all. Drivers are noticeably moving a full half-lane wider in broad daylight, and the solid red brake flare when rolling up to intersections is legitimately bright.

Verified Purchase · Boulder, CO · Cosari VeloPulse Pro

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David K.5 days ago

Cold machined aluminum and a real O-ring seal, no rubber flap

I killed two $65 name-brand tail lights in 14 months because gritty rear-wheel road spray always works past those tiny rubber Micro-USB flaps and corrodes the board. The second you hold this light you feel cold CNC aluminum instead of creaky plastic. Unscrewing the anodized cap to see a proper O-ring thread seal and a real USB-C port sold me immediately. Survived three soaking Pacific Northwest commutes this week without a drop inside.

Verified Purchase · Portland, OR · Cosari VeloPulse Pro

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Rachel S.1 week ago

Ordered mine in the coffee line after riding behind a friend

Rode behind my buddy on Saturday's morning group ride and every time we slowed for a turn or rolled up to a stop sign, his under-saddle light snapped to a solid bright red just like a motorcycle brake light. Meanwhile on the gentle pulse setting it wasn't blinding those of us drafting two feet off his wheel. Pulled out my phone at the coffee stop and grabbed one at the 50% off price.

Verified Purchase · Austin, TX · Cosari VeloPulse Pro

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Greg M.1 week ago

Haven't touched the power button in three weeks

The auto sleep/wake feature actually works the way you hope it will. I roll my commuter out of the garage at 6:45 AM and it clicks right back on in the exact flash mode I left it in. Lock the bike up outside the office, walk inside, and it shuts itself down two minutes later. Plus the four tiny green LED dots let you see actual remaining charge instead of guessing until it dies mid-ride.

Verified Purchase · Minneapolis, MN · Cosari VeloPulse Pro

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Brian H.2 weeks ago

Brake sensor ignores chipseal chatter

Tried a cheap smart brake light off Amazon last year and it stayed stuck on full brightness the entire ride because rough chipseal roads kept tripping the sensor, draining the battery in three hours. Cosari nailed the filtering here—it ignores road buzz and expansion joints and only flares up when I actually pull the levers to scrub speed.

Verified Purchase · Tucson, AZ · Cosari VeloPulse Pro

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Chris P.2 weeks ago

Quarter-turn lock doesn't budge on washboard gravel

Lost a $60 plastic clip-on light on a bumpy railroad crossing last fall—watched a pickup truck flatten it in my mirror. Put the saddle-rail bracket on my road bike and the heavy silicone strap on my D-shaped aero post gravel bike. Both come in the box, and the quarter-turn lock is rock solid over washboard dirt roads.

Verified Purchase · Charlotte, NC · Cosari VeloPulse Pro

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Lauren W.3 weeks ago

Super compact, just check saddle bag clearance first

Build quality is miles ahead of anything else under $50 and finally retiring my last Micro-USB cable feels great—charges off my phone cord in under an hour. Knocking half a point only because if you run a bulky strap-on saddle wedge bag, it will block the saddle-rail mount. Used the included seatpost mount three inches lower instead and it fits my frame great.

Verified Purchase · Madison, WI · Cosari VeloPulse Pro

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Steven R.3 weeks ago

Cuts right through midday coastal glare

Riding PCH at noon with sun glaring off windshields is sketchy even in a bright jersey. Tested this from 200 yards back down my street at 1 PM and the daytime strobe punches right through the glare. Weighs practically nothing in your hand yet feels indestructible.

Verified Purchase · San Diego, CA · Cosari VeloPulse Pro

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Tom B.1 month ago

Grabbed a second one so I stopped swapping between bikes

I'll drop $85 on a single road tire without blinking, so I realized how dumb it was trusting rush-hour traffic to a dim $12 blinky. Bought one VeloPulse Pro, rode with it twice, and immediately ordered a second one while the 50% off deal was still up so my commuter and weekend carbon bike each have their own dedicated light.

Verified Purchase · Philadelphia, PA · Cosari VeloPulse Pro

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Kevin L.1 month ago

Tiny twist-off cap takes ten seconds, rock solid otherwise

Unscrewing the light from the mount to get to the internal USB-C port takes a few extra seconds compared to an external plug, though once you see how clean and dry the threads stay after hosing mud off the bike, the trade-off makes total sense. Easily gets me through two full weeks of commuting on the breathing pulse mode before I even think about plugging it in.

Verified Purchase · Salt Lake City, UT · Cosari VeloPulse Pro

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Frequently Asked Questions

Will it fit an aero carbon seatpost and standard saddle rails?

Yes. Both mounts come in the box. The silicone strap fits round and aero/D-shaped posts from 22 to 35mm, and the rail bracket fits standard 7×7mm and 7×9mm saddle rails.

Can I turn off auto-sleep or the brake boost for group rides?

Yes. You can switch between Smart Auto Mode and Manual Constant Mode, and there's a low-glare breathing pulse that won't blind riders behind you in a paceline.

Does it charge with USB-C?

Yes. The port is USB-C, so it charges from the same cable and power brick as most modern phones. A USB-C charging cable is included, and a full charge takes about 90 minutes.

Can I still use a saddlebag?

Yes. If your saddlebag covers the rails, clip the light onto the included seatpost strap mount just below the bag. Switching takes about 10 seconds.

How do I check the battery before a long ride?

Click the button and the 4-LED green ring around it shows 100%, 75%, 50% or 25% remaining. Runtime is up to 45 hours in eco-pulse mode.

Will bumpy roads trigger false brake lights?

No. The accelerometer filters out vertical road vibration and only reacts to forward deceleration. In our chipseal and cobblestone testing at 22 mph, it only fired on real stops.

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