1、Using stereo surround sound, built-in noise reduction sound processor, the sound is clear and no noise. 2、Support for Bluetooth 0 connection, full compatible with most types of Bluetooth devices, wireless playback. 3、Supports U disk playback and memory card playback, and can also be played from mobile phones or other devices via audio cables. 4、The connection is simple, and the signal‑to‑noise ratio is ≥70dB, giving you a high‑quality sound experience. 5、Built‑in 1200 mAh polymer lithium battery, charging about 2H, can play about 6H. 1 x Speaker1 x Audio Cable1 x Charging Cable1 x Manual Item Type: Wireless SpeakerMaterial: ABSModel: A7SPower: 2x5WSpeaker Diameter: 45mm / 1.77in x 2, 4ΩFrequency Response: 100Hz-20kHzSignal to Noise Ratio: ≥70dBSound Mode: Movie/Music ModeFor Bluetooth Module: 5.0Transmission Distance: 10 m / 32.8ftConnection Method: Wireless BluetoothBattery Specifications: 1200 MAh Polymer Lithium BatteryPlaying Time: About 6HCharging Time: About 2HCharging Voltage: DC 5VAudio Input: Support for Bluetooth, for memory card, U disk, AUX