Shop through a wide selection of Desktop Wireless Chargers at Inter-Warehouse.com. Wireless charges use Qi, an open interface standard that defines wireless power transfer using inductive charging over distances of up to 4 cm – 1.6 inches. Desktop wireless charges use a charging pad, and a compatible device such as a mobile phone, which when placed on top of the pad, is charged via resonant inductive coupling. Also known as cordless charging or inductive charging, wireless charging uses electromagnetic induction to provide electricity to portable devices. Wireless charging technology is also found in a broad range of products such as power tools, electric toothbrushes and medical devices. Portable devices are simply placed near or on a charging pad or station to charge. An alternating current is run through an induction coil in the charging pad which creates a magnetic field. The magnetic field fluctuates in strength and generates an electromotive force which makes an alternating electric current in the receiving induction coil in the mobile phone or portable device. This alternating electric current is then converted to direct current, through the use of a rectifier, to charge a battery or supply power.