Feature: 1. HD BLUETOOTH CONNECTION: HiFi wireless music adapter to add HD wireless connectivity to any old home stereo system, AV receiver or powered speakers. 2. EASY 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. 3. HIGH 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. 4. LONG 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. 5. UPGRADED 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. 6. WIDELY COMPATIBLE: Bluetooth 5.1 power amplifier is compatible with mobile phones, tablets, computers, TVs, stereos, amplifiers, projectors and other input sources, wireless transmission. Specification: Item Type: Bluetooth 5.1 Digital Amplifier Material: Aluminium Alloy Size: Approx. 110x85x25mm / 4.33x3.35x0.98in Antenna Length: Approx. 108mm/4.25in Battery: Coin Cell CR2025 (Not Included) Bluetooth Version: V5.1 Bluetooth Reception Distance: Unobstructed 15m/49.2ft Interface Type: Aux, RAC Interface Basic Function: Bluetooth Reception, Smart App, Infrared Remote Control Music Format: MP3 APE FLAC WAV WMA. Package List: 1 x Bluetooth 5.1 Digital Amplifier (Battery Not Included)1 x USB Power Cable1 x Remote Control1 x Coaxial Cable1 x Optical Fibre Cable1 x 3.5mm Cable1 x Connecting Line Note: Please allow for some errors in manual measurements.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.