You can charge two devices simultaneously, charging a smartphone with a 1 amp outlet and a tablet with a 1 amp outlet or a single device up to 2.4amp offering a fast charge (in half the normal time) USB 2.4A (Chargers in half time). The FX Dual USB Mains Charger Can Be Used to Charge any USB device. The FX Dual USB Mains Charger can be used in conjunction with any USB cable to charge your mobile phone, tablet, eBook reader, MP3 player, camera and any other USB/Micro USB device. Intelligent IC chip which recognises a full battery and ceases to charge once the battery is full Short Circuit protection to avoid overcharging your device. FX Multicoloured Dual USB 'Mains Charger' 2.4 AMP Plug Gold