Product description easy to install retrofit 2 gang wall socket in white with dual usb ports built in charge two smartphones or a tablete reader features double pole switching for safety and reliability each socket is fully 13amp rated each usb port can deliver 21amps at 5 volts total usb power output is 21amps this product is easy to fit ensure the mains power supply is switched off at the consumer unit or meter board before starting work if in doubt always consult a qual