Can be attached to just about anything that accepts adhesive loop patch Marker makes for easy identification Useful marker / beacon device for various low-light activities (jogging, running, pet walking, camping, hiking, fishing); also useful as an emergency / safety beacon 200+ hour runtime F102 is a multi-function marker light which can fit in helmet, clothes and bag ,etc. Mainly used in various activities such as military training /action, outdoor sports, search and rescue, daily commuting ,etc. It will be to locate, identify and mark when using night vision or other equipment of inspection. Manufacturer: OPSMEN Specifications: Weight: 23g Dimensions: 45 x 50 x 18mm Waterproof: IPX8 / Up to 10 meters Working Temperature: - 20 C ~ 60 C Battery: 1 x CR2450 (Not replaceable)