The Recon Rear Brake Light is a multi functional rear light with an integrated accelerometer to detect a decrease in velocity and indicate braking. It also has several other modes including; fast strobe, low strobe, and Cob LED. Twenty plus hour run time with auto shut off, auto shut off in daylight, low battery indicator, and USB rechargeable 400mAH 3.7 volt battery. Full CNC chassis and completely water proof.