Diamond-shaped Rechargeable LED Bike Tail Light, Bicycle Tail Light, Rear Bike Light with Two-line Laser Beams Used As Bike Safety Light or Bicycle Brake Light for Cycling (Blue) 8 pieces of SMD LED light source controlled by smart LED button switch with 3 mode: slow flash, quick flash, normally on. 2 beams of visible red laser controlled by smart LD button switch with 3 modes: slow flash, quick flash, normally on Battery Powered by built-in rechargeable 3.7V 14500 lithium ion battery with 1,200mA.