See data sheet here Available in various sizes, see here Unilite Micro USB LED Headlight The Unilite Micro USB LED headlight has a 275-lumen lighting power and 2mm x 5mm red LEDs for night vision. It is USB rechargeable and a micro USB cable is included. This torch also has a red to green charging indicator to indicate the charging of the torch. Features and Benefits Easy push micro switch Rotational head is 45° Strong ABS housing 3M VHB helmet mount (included) Fully adjustable non-slip silicone headband Impact resistant is 1m Beam range is 95m 3.7V 1800mAh Li-Polymer battery Runtime is 6.30 hours to 170 hours Certifications CREE certified