1. Features: The LED light bicycle headlight is made of high-quality ABS material, the headlight is designed with 800 lumens of brightness, up to 500 feet of lighting distance, 95 lighting angles and 4 lighting modes to choose from. Whether it's road riding, a well-lit city bike or a dangerous mountain bike, it's perfect for all situations. 2. Mode: 5 recording methods, the precise measurement value can be adjusted, you can view the total distance, maximum speed, average speed, riding time and one-way record, suitable for outdoor riding trips and bicycle training. 3. Function: Bicycle odometer records average speed, top speed, mph/kph, riding time, odometer, one-way driving distance, effectively track your riding, with scan mode, speed comparator, maintenance, and more functions Time-sensitive sensors with magnets can accurately track the speed of the bike. Bright LCD display makes it easy to view cycling stats4. Horns and Bicycle Tail Lights: One-touch switch one of six sound modes: Bicycle Tail Lights feature IPX4 water resistance to make your bike stand out. It has unparalleled 360-degree visibility and a distance of up to 50 meters, just like low beam security lighting has a wide-angle viewing angle. 5. Wide range of uses: This bicycle light can be used as a regular flashlight for hiking, camping, walking, home or office power outage emergency flashlight, night family/kids activities, etc. Compatible with common bikes like road bikes, mountain bikes and folding bikes, this bike speedometer. Size: 14x11.5x4cmNote: battery models need to bring their own batteries