GP PB11 comes with 4 x AA 2000mAh batteries, a built in night light function, worldwise use with its 2 pin plug design. Two charging channels which can charge 2 or 4pcs NiMH AA or AAA battery. Able to charge 1 or 2pcs NiMH 9V battery as well. Save money, safe charging and easy handling. All GP PowerBanks are simple and convenient to use; just put in your batteries and leave it charging overnight. The automatic timer control guarantees a safe charging process after which you can take your charged batteries out when needed.