INVESCH USB Rechargeable LED Bicycle Tail Light Waterproof Ultra Bright Mountain Bike Warning Light Four kinds of light patterns:press switch 0.7 sec, turn on/off; press switch 0.1 sec: change modes Rechargeable lithium battery 330mAh, charge 2 hours, use 4- 12 hours Super waterproof properties Super bright with led light source - 50 Lumens Material: ABS