NiteRider Emax+ EV Ebike Taillight. The NightRider Emax+ 150 EV taillight brings NiteRider quality to Electric Bikes integrating with the ebike battery. Compatible with 6 to 80 Volts DC the Emax+ powers on with the bike and offers 6 modes. For Electric Bikes w/cable for connecting to E-bike battery Taillight powers ON with ignition switch 2 Steady and 4 Safety Flash Modes w/ Built-in Mode Memory (remembers last setting) Voltage 6 to 80 Volts DC Secure seat post mount fits 22mm-34.9mm Optional Rack Mount with rubber mounting shims