Feature 1、Personal Identification Marker Light: Offers both constant light and flashing modes to meet different usage needs in various situations. 2、Durable and Waterproof: Made from silicone gel material for excellent sealing and flexibility, ensuring long lasting performance even in harsh conditions. 3、Full Coverage Hook and Loop Tape: Backed with hook and loop fasteners for secure attachment. Comes with a hanging rope for versatile wearing options. 4、Helmet Signal Light: Provides bright and visible light for effective communication and signaling during outdoor activities. 5、Survival Light Outdoor Sports: Suitable for military, cycling, diving, hiking, and more. Can be attached to helmets, hung on backpacks, affixed to bike seats, or worn around the neck. Item Type: Helmet Signal Light Product Material: Silicone Gel Battery: Built in 150mah CR2023 Button Battery (Shipped With) Package List 1 x Helmet Signal Light