3M Peltor Alpha 1100 Lithium Ion Battery Pack for Peltor 300, 500 and Worktunes Ear Muffs

3.7V 1000mAH 3.7Wh Charge Voltage: 5.0V Intended to power certain 3M hearing protectors Compatible with the 3M WorkTunes Wireless Hearing Protector with Bluetooth Technology (Model #90542) Compatible with the Peltor Sport Tactical 300 and Tactical 500 Hearing Protectors (Model #: TAC300, TAC500) Includes USB charging cable Charge before use Read User Instructions and Safety Information prior to use