... effects" will make you full of praise. Mini Mobile Phone Speaker can play MP3 format music from SD/MMC cards (MMC ... sourcess from mobile phone, MP3, MP4, PC, etc. This SD Speaker with built in rechargeable Li-ion battery for convenience use ... using.Specification:Input: 5.0V Power Output: 3.7V, 1000MA Speaker Output: RMS 2.5W THD=10% Frequency response: 150Hz-18000Hz ...