This Portable Battery Pack turns the Bluetooth Media Server into a wearable unit. The battery will last up to 48 hours before recharging. The pack comes with an LED test button letting you know instantly how much charge is left in the battery. A recharger is supplied with the unit. <br /> <br /> Cell: Lithium-ion cell<br /> <br /> Battery Capacity: 60Wh<br /> <br /> Battery Output Voltage: DC12V<br /> <br /> Battery Output Current: 2A<br /> <br /> Charge Time: 3 hours(3.5 hours maximum charge)<br /> <br /> Cycle Life: more than 500 times<br /> <br /> Charge Temperature: 0℃~40℃<br /> <br /> Discharge Temperature: -20℃~60℃(Recomend -10℃~50℃)<br /> <br /> Storage Temperature: -10℃~40℃(Recomend -5℃~35℃)<br /> <br /> Battey Size: 157mmX76mmX22mm<br /> <br /> Battery Weight: 420g<br /> <br /> Battery Gauge: 5 level LED indicator<br /> <br /> Battery Protection: over-charge/over-discharge/excess current/short circuit<br />