Multipurpose Helmet Light Safety Flashing Waterproof Survival Lamp Lightweight Built-in CR2032 Button Battery for Hiking Cycling Feature: 1. Lighting Mode: The helmet flashlight has two modes, including normal lighting mode and flashing mode. 2. Built-in CR2032 Battery: The survival signal light has a built-in CR2032 battery that can work for about 100 hours. When the battery runs out of charge, you can replace it yourself (but replacing the battery will affect the waterproof function of the product). 3. Waterproof: The helmet light is made of high-quality silicone and gel, with good sealing (waterproof) and flexibility. This product can operate well in environments ranging from -20 C to 50 C. 4. Multipurpose: You can hang the signal light on your backpack, helmet, bicycle seat, or neck. This type of flashlight is crucial for outdoor activities such as cycling and hiking. 5. Satisfaction Guarantee: We strive to provide each customer with the highest standard of customer service to ensure you have a pleasant shopping experience. If you have any issues, inquiries or need assistance,