Gently contoured 7mm plate with rounded edges, includes screw cap covers. Comes with two built in USB charger slots rated at 5V DC 3.1A (shared across both slots). 13A rated. Top access to captive terminals to speed up installation. Twin earths. Manufactured to the latest British Standards. Recommend fitting into a 25-35mm back box dependent on wiring conditions. NB: requires 35mm pattress box if surface mounting (CU1800).