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You can use the Battery Pack as a charger or an extended power source quadrupling your record time. The RePower 4400 battery pack is compatible with all of the RePower (DC HW) battery adapters with a 2.5 mm threaded DC jack.FEATURES: Power On/Off button for storage LED battery level indicator Input: Mini USB 8-pin connector Output: 2.5 mm threaded DC jackPOWER: 4400 mAh Rechargeable Li-ion Charge Voltage: 5V Charge Current: 1A Output Power: DC 5V 1AWEIGHTS / MEASUREMENTS 138 grams (4.9 oz) 52 mm Width (2.04 in) 34 mm Height with Clip (1.3 in) 81 mm Length (3.2 in)