USB Charger

USB chargers can be used to recharge many portable devices including phones, e-cigarettes and battery chargers.

USB (Universal Serial Bus) is an industry standard that establishes specifications for cables, connectors and protocols for connection, communication and power supply between the point and their peripheral devices. 

A regular USB 1.0 or 2.0 socket has four pins, and a USB cable has four wires. The inside pins carry data (D+ and D-), and the outside pins provide a 5-volt power supply. USB 3.0 ports add an additional row of five pins, USB 3.0-compatible cables have nine wires. In terms of actual current (milliamps or mA), there are three kinds of USB port dictated by the current specifications: a standard downstream port, a charging downstream port, and a dedicated charging port. The first two can be found on your computer, and the third kind applies to most wall chargers. The difference, in essence, is the place found and charging time.

With so many devices requiring a USB port to charge, it is easy to run out of plug space. Rather then purchasing multiple double adaptors and power boards, purchasing one device with multiple USB ports adds the additional USB port without the clutter.