Bicycle Tail Light,KSTON Waterproof Safety Flashing Lamp USB Rechargeable Cycling Smart Bicycle Light Bike Rear Wireless Remote Control Light Turn Signal LED Tail Light Smart Wireless remote control bicycle turn light Wireless Control make it more convenient to operate Battery: Controller by Button Battery (included),Light by Built-in lithium battery 3 mode light: Left turn /Right turn/ Tail lightTail light Mode: Steady and flashing 4 Mode Wireless Remote Control- Wireless remote controller allow you to operate the rear light easily during riding, and you don't have to bend over to turn on/off the tail light any more.