Remax 20000mAh power bank is compatible with mobile phone, tablet, MP3, PSP, digital camera etc. The REMAX power bank/box is used as a portable device to charge your device on the go. The Remax power bank/box is compatible with any device from mobile phones, tablets and digital devices. It's capacity is 20000mAh, which can charge your device with one whole charge. It protects your device from overcharging. You can charge your mobile phone anywhere by carrying this small device. Its dual USB port helps you to charge 2 devices at a time. It does not overcharge the battery of the devices.