Nameo Bike Laser Tail Light Waterproof, 2 Laser 5 LED 7 Flash Modes Cycling Safety Bicycle Rear Light The 2 red laser beams create a virtual lane around your bike to protect and keep you safe during night-time cycling or in the dark. A must accessory for cyclists or anyone with safety concerns or worries about the dangers of cycling at night. Works for up to 36 hours and has a simple, tool-free application allowing you to be safe and secure on the roads in very little time. IPX2 Waterproof, safer in water fog when riding in the rain. Powered by: 2 AAA batteries (batteries included).