1. Lightweight, compact and engineered to withstand extreme conditions and use. 2. Attaches to cap for the most practical, hands-free light source available. 3. This LED cap light is good design for biking, jogging (use the flashing mode), camping, hiking and anytime you need bright illumination (Cap not included). 4. 5 Ultra bright LEDs, ON / OFF switch. 5. 2 modes: 5 LED light, 5 LED flash. 6. Power supply: 2*CR2016 cell batteries (included). 7. Put 2pcs CR2016 cell batteries, it can last for approx 48 hours, the life of LED is more then 10,000 hours.

http://olla.gr/head-light-lamp-cap-torch-bulb-5-led-white-light-for-outdoor-fishing-camping-hunting-black/