Tooless connection, Just plug one cable into the front and one into the back of each port.
USAGE INSTRUCTIONStep: 1. Dig hole on the drywall. 2. Put the mounting bracket (not include) in the hole and tighten it with screw drivers. 3. Layout the cable from mounting bracket. 4. Separate the decora plate, usb outlet and frame. 5. Install decora plate and usb outlet firstly on the bracket. 6. Install the frame on the drywall. Faster Charging, Relax and Recharge Your BatteriesIQIAN USB Charger Wall Outlet, Dual High Speed 4.0 Amp USB Ports with Smart ChipWe Take Your Safety SeriouslyTamper Resistant Shutters - Prevent children from inserting any unwanted objects into the outlets5VA Flame Resistance Material - Reaches the Highest UL94 Flame Resistance RatingShort Circuit ProtectionOverload ProtectionUnder Voltage ProtectionOver Current ProtectionOver Voltage Protection