GTMax Black 2-Port USB Travel Charger for Boost Mobile Samsung Galaxy Prevail Brand new non-OEM. Input: 100V - 240V (U.S. & World Standard). LED light power indicator. Intelligent IC chip inside recognizes a fully charged battery and automatically switches to a saver mode to prevent overcharging and short circuit. You must have a USB charging cable (sold separately) in order to charge your MP3 player with this charger.