Bicycle Light Rear Lights Back Light Waterproof USB Rechargeable LED Bike Lamp
Mode: Four modes. Function: The key can be switched, flicker, turn on the light long press. Net weight: 43 grams. 1 Charging cable. Size: 7.1 2.1 2.2 cm. Material: Plastic. Battery: 3.7V, 600mah lithium battery.