Welcome to the store! 1. HD BLUETOOTH CONNECTION: HiFi wireless music adapter to add wireless HD connectivity to any old home stereo system, AV receiver, or powered speakers. 2. EASY TO USE: Mini Bluetooth 5.1 digital amplifier is simple to set up. Connect the adapter to your music system in seconds and wirelessly stream high-definition audio from your smartphone, tablet, or computer. 3. HIGH-DEFINITION AUDIO: Mini Bluetooth 5.1 digital amplifier with analog RCA and digital output options, digital optical, and digital coaxial for true high-definition sound. 4. LONG RANGE: Bluetooth 5.1 digital amplifier extends wireless range up to 15m/49.2ft with special circuitry and an external gain antenna, providing trouble-free performance through multiple walls. 5. UPGRADED BLUETOOTH FUNCTIONALITY: Bluetooth 5.1 digital amplifier upgrades conventional audio to wireless audio with dual AUX and RCA outputs, USB stick input for decoding playback, and microphone input. 6. WIDE COMPATIBILITY: Bluetooth 5.1 power amplifier is compatible with mobile phones, tablets, computers, TVs, stereos, amplifiers, projectors, and other input sources for wireless transmission. Item Type: Bluetooth 5.1 Digital Amplifier Material: Aluminum Alloy Size: Approx. 110x85x25 mm / 4.33x3.35x0.98 inches Antenna Length: Approx. 108 mm/4.25 inches 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 1 x Bluetooth 5.1 Digital Amplifier (battery not included) 1 x USB Power Cable 1 x Remote Control 1 x Coaxial Cable 1 x Optical Fiber Cable 1 x 3.5mm Cable 1 x Connection Line Your 100% satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage or incorrect quantity, please contact us immediately, and we will provide you with the best solution!