Functions: External TF card, U disk, supports a maximum of 32GB of memory.Supports MP3 WMA file playback.FM radio 87MHz - 108MH.Lyric display with Karaoke function.20W power output.Hi-fi recording, FM recording.Time display, alarm clock and calendar. Remote control optional, remote control distances 50M.9. size: 93*122*51mmLoud Portable Voice Amplifier Caller with FM Radio and 20W Output PowerKey Specifications/Special Features:The product is of delicate design, with loud and clear Hi-Fi sound Easy to carry Suitable for party, teaching, tour guide, commodity promotion and entertainment for the old and young Features: Connectable to external TF card and U-disc, supports maximum of 32GB memory Supports MP3 WMA file play FM radio: 87 to 108MHz Lyric display, karaoke function 20W power output Hi-Fi and FM recording Time display, alarm and calendar Optional remote function (remote control distance of 50m)Technical parameters: Output power: 20W Frequency response: 100Hz to 10kHz Power supply: 7.4V DC, 2,000mA Charging voltage/current: 8.4V DC/1,000mA Support formats: MP3, WMA, WMV Remote frequency: 433.92MHz