... 4flash functions 3)Battery:2xLR44 4)Multifunctional water-resistant silicone lig Silicone bicycle safety light/bicycle back light/bicycle LED lamp ... more convenient and can be fixed on the handlebar, seat pole, helmets, backpacks, wheel hubs, etc. used at different locations ... , seatpost, helmet, wheel, bag and so on. Flexible silicone surface Surface color: White,black,blue.Custom color available for ...