Transmission distance: 10 metersBluetooth version: Bluetooth4.0+EDROutput power: RMS 10W (2*5W)Diaphragm: 2Signal to noise ratio: 76dbPlay format: MP3, etc.Frequency response: 100HZ---18KHZBuilt-in lithium battery: 3.7V 2000mAhPower input (USB): DC 5VHousing: plastic / iron meshPower supply mode Built-in lithium batteryProduct size: 40cm (W) * 5.5cm (D) * 6cm (H)TF card: support 1: Built-in high-capacity lithium-ion battery, DC5V charging.2: Support MP3 music playback, support Bluetooth connection.3: After the mobile phone opens the Bluetooth search to the device, the connection is paired.4: After the pairing is successful, Bluetooth will have a tone indicating that Bluetooth is connected.5: Support mobile phone audio Bluetooth transmission to audio playback music, support for using Bluetooth to answer calls.