Characteristics: Outdoor Portable, Bluetooth Wireless Connection, Music Playback, Support Storage, Support Mainstream MP3/WMA/WAV audio format playback, Support U disk built-in high-performance lithium battery, Support USB power charging. Compatibility: Computer, Mobile Phone, MP3 and other multimedia audio player. Colour: Iron Ash, Bright Silver, Black Technical Parameters: Effective Distance: 10M Output Power: 3Wx2 Charging Voltage: DC 5V Frequency Response: 100Hz-20KHz Signal-to-noise ratio of SNR: ≥70db Distortion: 1% Audio Input: Bluetooth/TF Card/U Disk Speaker Unit: 4Ω Form of Adjustment: Press Key