Compact, lightweight fender-mounted StVZO certified e-bike taillight with custom-programmed Alert Technology. It features four high-output emitters that provide a constant 11 lumens and then 22 lumens when deceleration is detected. Its co-molded design is constructed from durable Composite Matrix material, which provides an IPX7 waterproof rating. It comes with an integrated 130 cm (51.2 inches) cable that connects to the e-bike's motor/battery system. Stainless steel mounting hardware is included. Compatibility: 6-12v input, 1.2w. Download the manual below for further installation and compatibility details.