Apollo23-Water Resistant Bike Bicycle Wheel Spoke Tyre Bright LED Light Lamp, 3 Modes Specially designed for the occasional rider or casual cyclist Simple to use, long lasting, and safe Secure, remains securely locked in position, even during off-road use Be seen while riding your bicycle, this LED light is the perfect solution for night-time safety when biking. 3 Kinds of switch: full light, quick flash, slow flash