Emax+ 150 is NiteRider's first taillight specifically made for electric bikes. It comes with a power line that's pre-wired for connection to the eBike's battery. Power line cable measures approximately 52" in length. Taillight powers ON with ignition/ power switch. Features six modes-Steady ON and varying flashes-with Built-in Mode Memory (remembers last setting). FEATURES - Lumen Output: 150 - 6 Modes - Hardwired, Voltage 6 to 80 Volts DC - Water / Dust Resistant IP64 Rated - Weight: 75 grams - Fits 22mm-34.9mm seat posts - Includes a pre-wired Emax+ 150 Taillight, Seat Post Clamp Mount, Rubber Mounting Shims, and Rack Mount LIGHT MODES 1) Fast Flash 2) Slow Flash 3) Disco Flash 4) Pulse Flash 5) High Steady 6) Low Steady NiteRider recommends this taillight be installed by an authorized e-bike service and repair shop.