can this light be mounted on a horizontal bar? or does it have to be a vertical bar?

With the included hardware this will absolutely NOT mount to a horizontal bar. It is only designed to be mounted to a vertical tube. However - using a pair of 1/2" rubber coated cable clamps you can get this mounted to the 1/2 rear rack tube common on several current ebikes. I went with the rubber-coated clamps as I believe it'll grab better and also protect the paint over bare stainless or galvanized steel.

How easy is this for a thief to remove?

Once the actual unit is in place, it is not all that easy to remove it! However, as it is only plastic, a determined thief would be able to remove it if they wanted to. The handlebar controller is the same.

Does anyone have a video of the automatic brake light function while slowing down?

Hello: Below is a video of the automatic brake light function while slowing down. Onvian

What do you do if you arm it then lose the remote?

You don't need the remote to operate it, you can use the buttons on the unit.

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🚴‍♂️ Light up your ride, own the road, and never ride unseen again!

SMART BRAKE SENSING - Automatically lights up brake signal for 2 seconds to alert drivers behind you, enhancing night safety.
5 IN 1 SAFETY POWERHOUSE - Turn signals, brake light, horn, alarm & warning light all in one sleek tail light.
WEATHERPROOF THEFT DETERRENT - IP54 waterproof design with a piercing 110dB alarm to scare off thieves and withstand all conditions.
LONG LASTING RECHARGEABLE BATTERY - USB-C rechargeable with up to 70 hours of runtime and intelligent auto on/off modes to save power.
COMMAND ATTENTION WITH WIRELESS CONTROL - Remote-operated left/right turn signals and 3 distinct horn sounds keep you visible and heard blocks away.

The ONVIAN Smart Bike Light is a cutting-edge 5-in-1 rear bike light featuring ultra-bright 160 lumen COB LEDs, wireless remote-controlled turn signals, a smart brake sensor, and a powerful 110dB anti-theft alarm. Designed for professional cyclists who demand safety and style, it offers up to 70 hours of rechargeable battery life, IP54 waterproof durability, and intelligent auto on/off modes to optimize power use. This all-in-one device ensures maximum visibility and security on every ride.

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TrustScore 4.5 | 7,300+ reviews

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Fantastic and great service. Shipping was faster than expected.

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Color	White
Size	4.92 x 3.82 x 1.3"
Shape	Seatpost Mount - Square Remote
Material Type	Plastic
Power Source	Battery Powered
Sport	Cycling
Included Components	Bike Alarm Tail Light, Wireless Remote
Batteries Included?	Yes
Brand	Onvian
Manufacturer	Onvian
Item model number	KS-WL10C
Product Dimensions	12.5 x 9.7 x 3.3 cm; 260 g
ASIN	B099PFTNBB

ONVIAN Smart Bike Light With Turn Signals, Horn and Alarm - Rechargeable Rear Light, Waterproof Auto ON/Off, Bicycle Turn Signals and Brake Light

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