... 80 hours (200 hours standby) 2.cost-effective portable headphone amplifier, perfect sound quality A CLOSE LOOK:Technical parameters1.maximum ... circuit.2.independent professional circuit design, cost-effective portable headphone amplifier, perfect sound quality.3.TI, HIFI level by the ... capacity lithium polymer battery(700mA), has a long life with a variety of protection.7.International Pop Gold FR- ...