... Wholesale--- 4000 mah USB external power bank portable battery charger for different mobile phones and digital electronic products.. BD-U1 ... 500times charge and discharge.2.It supply power for digital device like iphone, ipad, Samsung P1000,cell phone,mp3,mp4 and more ... (1s ) output, then press the button (1s ) off. *Use for Iphone,HTC,Samsung,Nokia,MOTO,and other mobile phones,Ipad , Ipod,Camera ...