Review on WSDCAM Smart Bike Tail Light With Turn Signals And Brake Light, Bike Alarm Horn With Remote, Auto ON/Off Rechargeable Waterproof Bike Horn Alarm Rear Bike Brake Light Turn Signals Bicycle Tail Light by Steven Emberling

SMART AUTO ON/OFF - Build in light sensor and motion sensor. On Slow Flashing & Breathing modes, tail light will auto shut off after 30s of inactivity in dark environments, and auto light up when motion is detected. And in bright outdoor environments it will auto shut off to save power, if you need tail light in day time, you can select Fast Blinking/Steady Light (these 2 modes have not smart function). (Note: Indoor environment is dark environment, no matter if the lights are turned on or off)