... Type: Li-ion Life Circle:more than 500 times 4000mAh Power Bank for iphone,mobile phone,smartphone,ipod Battery Type Li ... to connect the device and power bank.3,turn on power bank.4,While cherging device,the LED power indicators will light up ... will turn off automatically.The power bank will turn off after 20 minutes' disconnection. Power bank,5V4000mAh,portable power,for iphone,mobile phone,smartphone ...