The USB charger can be attached with a magnet or clamped to a table edge. You can charge up to 3 devices at the same time as the charger has 3 individual USB ports. The cord is 1.9 m between the plug and the USB ports, allowing you to connect it to the wall socket ‒ so you can place the USB ports where you want to use them. 3 USB ports. Equipped with auto-detect function ‒ the USB charger detects the connected device and adjusts the power output accordingly. The clamp fits table tops 1-2.5 cm thick. Charging time may vary based on the device’s battery capacity, charge level, the age of the battery and the temperature in the surrounding area. Voltage USB ports: 5Vdc. Comes with built-in over-current protection, short-circuit protection and over-heating protection. Total output of 3.4A, 17W. Maximum output per USB port: 2.4A.