Flat plate low profile design, 1G size outlet plate with QUAD USB charger function giving you flexibility to charge multiple USB devices 5V DC 5.1A rating - 1 x 2.1A dedicated slot for high power devices like iPads and Tablets and 3.0A shared over 3 ports for lower drain devices this unit also has built in overload and short circuit protection for peace of mind Min mounting box depth of 25mm