Compact Universal Spare Battery Charger with LCD Screen Display and Extra USB Output to Charger Additional Device Simultaneously for ZTE Warp SYNC N9515 9515 ( Boost Mobile Phone ) Perfect travel companion Ideal for charging a spare battery Small and compact design compatible with 110-220V Automatically detects positive/negative polarity contacts Compatible with Most cell phones, PDA, MP3 players and digital cameras with Li-Ion, Ni-MH batteries.