TRIXES 2 LED Silicone Bike Lights Front & Rear set Cycle Safety Clip on Bright 2 LED Bike Light Batteries included (2 x CR2032 batteries per light) ** To insert the batteries, please remove the silicone cover from the light unit. Remove the small round plastic cover off. Insert the 2 supplied CR2032 Batteries with the + facing upwards (away from button). Then put the battery cover back on to the light module and slide the silicone cover back on the light. One button operation 3 Modes of operation On/Fast Strobe/Slow Strobe Quick and easy attachment