1、Using 2 LED lights, high brightness and energy saving, greatly increasing the safety of night riding, can be used as a warning headlight/taillight or as a head lamp to read the map during night. 2、Use ordinary AG10 button battery, easy to get and replace. The outer layer is covered with high‑elasticity waterproof silicone, cold and heat resistant, stable and durable, and has strong extension and tension. 3、Three lighting modes can be switched quickly with one button, fast flashing, slow flashing, normally on and off, just press the central button to switch. Water‑resistant and anti‑drenching design, not afraid of rainy days. 4、Double hanging buckle design, get rid of the shackles of the base, can be installed in any position. Can be installed on the handlebars, seat cushion risers, front forks, seat stays, rear helmets, backpacks, wheel hubs, etc. 5、Quick‑release design, installation or disassembly can be done without any tools in 3 seconds. Lightweight enough, suitable for emergency lighting, outdoor lighting, mountaineering lighting, and bicycle lighting, etc. 2 x Bicycle Light  Item Type: Bicycle LightMaterial: Plastic + SiliconeSize: Approx. 4.5 x 2.5cm/ 1.8 x 0.98inBattery: 2Pcs x AG10 button batteries 150mAh (Built-In)Light Color: White3 Lighting Modes: Fast flashing, slow flashing, normally on