This lightweight, compact travel or home wall charger plugs directly into your phone to provide power to your phone. You can leave your cell phone ‘ON’ while charging but for faster charging time, turn the phone ‘OFF’ while charging. Integrated overcharging prevention I/C will help prevent battery explosion due to overcharging of the battery. Great for travel with the compact size and charges up most micro usb cell phones and devices. Also Compatible with NEW Apple iPhone 4S.