Note: Please allow for some errors in manual measurements._x000D_Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Specification: Item Type: Bluetooth 5.1 Digital Amplifier_x000D_Material: Aluminium Alloy_x000D_Size: Approx. 110x85x25mm / 4.33x3.35x0.98in _x000D_Antenna Length: Approx. 108mm/4.25in_x000D_Battery: Coin Cell CR2025 (Not Included)_x000D_Bluetooth Version: V5.1_x000D_Bluetooth Reception Distance: Unobstructed 15m/49.2ft_x000D_Interface Type: Aux, RAC Interface_x000D_Basic Function: Bluetooth Reception, Smart App, Infrared Remote Control_x000D_Music Format: MP3 APE FLAC WAV WMA Features: 1HD BLUETOOTH CONNECTION: HiFi wireless music adapter to add HD wireless connectivity to any old home stereo system, AV receiver or powered speakers. 2EASY TO OPERATE: Mini bluetooth 5.1 digital amplifier is easy to set up, connects the adapter to your music system in seconds and transmits high resolution sound wirelessly from your smartphone, tablet or computer. 3HIGH RESOLUTION SOUND: Mini bluetooth 5.1 digital amplifier with analogue RCA and digital output options, digital optical and digital coaxial for true high resolution sound. 4LONG RANGE: Bluetooth 5.1 digital amplifier extends the wireless range to 15m/49.2ft feet with special circuitry and an external gain antenna, providing trouble free performance through multiple wall. 5UPGRADED BLUETOOTH FUNCTIONALITY: Bluetooth 5.1 digital amplifier upgrades conventional sound to wireless sound with dual AUX and RCA outputs, USB stick input for decoding playback and microphone input. 6WIDELY COMPATIBLE: Bluetooth 5.1 power amplifier is compatible with mobile phones, tablets, computers, TVs, stereos, amplifiers, projectors and other input sources, wireless transmission. PackageList: 1 xBluetooth5.1DigitalAmplifier (Battery Not Included)1 x USB Power Cable1 x Remote Control1 x Coaxial Cable1 x Optical Fibre Cable1 x 3.5mm Cable1 xConnecting Line