Features: Slim and compact for comfort Built-in LED indicator that shows remaining power Premium A cells with thermal and short circuit protection On-board fuel gauge shows battery charge – 1 LED : Low Power, 2 LED : Half Power, 3 LED : Fully charged Compatibility: Compatible with Gerbing 7V gloves and garments that have an onboard temperature control button Additional Details: 2600 mAh, 19.42 watt-hours Rechargeable up to 500 times Fully charged in 2 to 8 hours Weight : 3 oz. Dimensions : 3” x 1.5” x 1”