LED rear lights with constant and flash modes, visible up to half a mile (one press for constant mode, two for flash). CR2032 battery (supplied) gives 144 hours of use in flash mode, 72 hours in constant mode High visibility reflective detailing. Phone compartment fits most standard and +sized phones Flip-down touch window – use phone screen on the move. Fully adjustable waist and shoulder straps fit most sizes. Water-resistant and ultra-lightweight Available in fluorescent yellow and black.