The iWalk white Wireless Charging Pad for iPhone X/8 and Samsung Galaxy S 8 is compatible with both iOS and Android devices. At 7-1/2 watts/10 watts, it can achieve maximum wireless charging speeds. It has Qi inductive charging technology and its power source is a detachable micro USB cable. This case-friendly universal charging pad has an 8 mm. charging zone that will disconnect power if the devices deviate from that zone.