... .T/T,Western Union,Paypal 3.CE 4.Timely delivery External backup battery for iphone 4Thanks for your purchasing our mobile power . ... ,and keeping properly for your looking up The product specification ;Battery type: Lithium batteryProduct number : TB021Size: 126.7mm*63.3mm* ... power2. swith the power to “ON” , Iphone insert to the battery can discharging the power More details,please feel free to ...