With Seidio's Multi-Function Battery Charger, you will never be forced to wait around for one of your batteries to charge. Because this versatile accessory charges both your spare battery and your device at the same time, you will always be powered and ready to go. By plugging the charger into an AC outlet, and the device cable into the charger, you can charge both your spare battery and your device at the same time. The Multi-Function Battery Charger can also be used as a desktop battery charger when plugged into a laptop with a USB cable (not included). The charger includes a base, a battery charging plate, and a device charging cable. Additional plates can be purchased separately for use with other Smartphones.