ETOPSTECH 'Laser Lane' Bicycle Tail Light with Virtual Bike Lane The 5 LED & 2 red laser beam bicycle safety light creates a virtual lane around your bike, helping to protect and keep you safe from incidents during night-time cycling or in the dark. The laser bike light is the perfect accessory for keen cyclists or anyone with safety concerns or worries about the dangers of cycling at night after recent stories of car and bicycle collisions in the news. The product creates a highly-visible laser lane subconsciously avoided by other road users as well as having a bright flashing light drawing maximum attention to your presence and position. The laser bike light 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. Powered by: 2 AAA batteries(Not include)