LOPOO X6 Smart Bike Rear Light, 50 Lumens USB Rechargeable Bicycle Light LED Sensor & Movement Sensor with 6 Flash Models for BMX Bike, Moutain Bike, Road Bicycle (Black) Safety First: All for your safety especially when riding at night Smart ON/OFF rechargeable smart bicycle rear light with cool appearance IPX6 Waterproof, 6 Flash Modes, 16 LEDs, 36 Flashing Hours, 50Lumens, 5000h service life Having the function of light sensor and cycling intelligent detection Multiple technology functions give you the experience of pleasure riding