Lyte 20 Single Door Mobile Phone USB charges 20 devices up to 7 Inches screen size smartphones, mobile phones and handheld USB devices (including protective cases) via a 20 port USB A Hub. The individual device compartments store devices horizontally within a compact footprint. It is fast and efficient, delivering fast speed charging at the optimum rate, 2.1amps maximum per port. This unit never overcharges as it detects when the device battery is full providing trickle charge. It is equivalent to 20 x 12W USB A Charging Ports saving you space and power consumption, replacing extension cables and power sockets with one cable into the wall.