Lezyne femto front 15l rear 7l light setfemto drive is a compact bright safety light lens is made of high grade optical material and serves as an activation button that cycles through four flash and one solid mode cnc machined aluminum body makes the femto drive a durable and weather resistant light composite matrix back plate can be unscrewed to replace the two cr2032 disposable batteries multi position silicon rubber strap attaches directly to the back plate to secure the light to a wid