1、PLUG AND PLAY: Wireless sound adapter can transfer music from your mobile phone, computer or tablet to any home stereo system via Bluetooth. You can also transmit music from TV, computer, projector and loudspeaker to Bluetooth headset or speaker (automatic short distance connection), which is plug and play and easy to use. 2、STRONG COMPATIBILITY: Bluetooth HiFi sound adapter uses 5.1 chips to ensure fast and stable Bluetooth connection, including Bluetooth 5.0 4.2 4.0. It supports AUX, RCA, optical fiber and coaxial ports, and also supports USB flash drive and memory card to play music, which has strong compatibility to meet your daily music experience. 3、BLUETOOTH 5.1 CHIPSET: The verified Bluetooth 5.1 chipset is a premium solution to provide wireless sound performance, which ensures that HiFi sound signals transmit music streams to your home stereo system, enabling a more stable connection with devices. 4、EXTERNAL ANTENNA DESIGN: External antenna design reduces signal interference and can receive Bluetooth signals within 15m. Built in 800mAh large capacity battery, it only takes about 2 hours to charge, and it can provide up to 6‑8 hours of playback time, which is very suitable for traveling and carrying. 5、MULTIFUNCTION INDICATOR: Bluetooth sound adapter transmitter receiver is designed with a variety of function indicators to see the functional status of the product more intuitively. It also supports the remote control (attached) to adjust the volume up and down, up and down tracks, and connect channels. Item Type: Bluetooth 5.1 Sound Receiver Transmitter Material: Aluminum Alloy Bluetooth Version: 5.1 Frequency Range: 2400MHz-2483.5MHz Frequency Response: 20Hz-20KHz. Function Mode: Bluetooth Receiving And Bluetooth Transmitting Transmission Distance: Approx. 15m/49.2ft Input: Bluetooth Sound, Optical Fiber Sound, Coaxial Sound And AUX Output: AUX RCA Peripheral Support: U Disk, Memory Card (Maximum Support 128GB, Not Included In Delivery) Input Voltage: Type C 5V 1A Usage Time: About 5-7 Hours Host Battery Type: 800mAh Lithium Ion Battery (Built In) Remote Battery Type: 1 x CR2025 Button Cell (Not Included) 1 x Bluetooth 5.1 Sound Receiver Transmitter 1 x Optical Fiber Line 1 x RCA Line 1 x 3.5mm Sound Cable 1 x Antenna 1 x Type C Charging Line 1 x Remote Control 1 x Instructions