Nite rider sentinel 2w usb rear lightthe sentinel 2 watt tail light has a powerful 2 watt led 5 modes is usb rechargeable and has a brand new safety feature laser lanes the laser lanes mode is designed to project ultra bright laser lines on the ground giving the rider their own virtual lane features run time 18 hours first flash 7 hours second flash 45 hours high steady 36 hours low steady lumens 30 battery 1000mah x 1 charge time 4 hours light levels 2 flash 2 steady laser