Communicate with the traffic around you with the Fabric FLR30 Accelerometer Bike Brake Light. Working in unison with your bike, this intelligent light activates when it senses your acceleration. Coming with a versatile strap, you can attach this light anywhere. It works on your seat post, your rear triangle, or even your helmet. The built-in accelerometer detects your speed. Incredibly, its brightness increases as your speed decreases. It’s perfect for those who cycle on roads. In addition, any brightness of the light helps to notify those on the road of your location. Offering heightened safety, the FLR30 is a must-have for any cyclist. The durable nylon-plastic bracket makes attachment a cinch. With a ratchet in the mount, the FLR30 has 20 different positions for optimal visibility. On full power, the FLR30 will last eight hours. It also functions in flash and strobe modes