Specification: 660nm Red Light Irraditated Area: 660mw/cm2 Material: Aluminum Alloy Battery Information: 1. 18650 Liion Rechargeable Battery ‒ 3000mAh 3.7V. 2. Sheef-life around 10 years. Environmental friendly. 3. 7-8 hours to be fully charged and it can be used about 50-80 times. 4. Battery is longer than original 65mm battery because Liion battery protection is applied. 5. Please press in first and roll the battery in when installing it. Packing List： Flashlight ×1 USB Charging Cable ×1 Power Adapter ×1 Black Sunglasses ×1