For SanDisk Sansa Clip+ 4GB MP3 Player 10W 2100mAh Dual USB Ports Wall Home House AC Charger w/ USB Cable High Performance 10W Dual USB AC Home Wall Charger Adapter Dual USB sockets allow you to charge 2 devices at once. Simply use a compatible usb cable for your device to get charge up from this charger IC Chip recognizes a full battery & automatically switches to saver mode. Input: AC100-240 Volts ?Output: 5.0V ~ 2100mah