> mobile power pack for iphone 4/4s , emergency /backup power pack > 2 in 1 power supply & protection case for iphone4 /4s , anti-broken structure to protection from unexpected damage Specification : Battery type: polymer lithium battery Input: dc 5v 500 ma Output: dc 5v 500ma Charging time : about 4 hrs Discharging time: about 4 hrs Standby consumption :10 ua Standby time : 450 hrs Talking time: 7.5 hrs Surfing time: 6 hrs Wifi playing time: 13.5 hrs Audio playing time: 4.5 hrs Video playing time: 1.5 hrs Unit weight 75g. > charge or sync with itunes without taking iphone4 out of the case > 4 led lights power indication , > protective ic circuit efficency to advoid short-circuit , overcharging , discharging , malfunction under extreme condition Qty/ctn: 50 pcs G.W./n.W.: 10.5/9.5 kgs Ctn size : 60*22*30 cm.