Specification: Item Type: Bluetooth 5.1 Sound Receiver Transmitter_x000D_Material: Aluminum Alloy_x000D_Bluetooth Version: 5.1_x000D_Frequency Range: 2400MHz-2483.5MHz_x000D_Frequency Response: 20Hz-20KHz._x000D_Function Mode: Bluetooth Receiving And Bluetooth Transmitting_x000D_Transmission Distance: Approx. 15m/49.2ft_x000D_Input: Bluetooth Sound, Optical Fiber Sound, Coaxial Sound And AUX_x000D_Output: AUX RCA_x000D_Peripheral Support: U Disk, Memory Card (Maximum Support 128GB, Not Included In Delivery)_x000D_Input Voltage: Type C 5V 1A_x000D_Usage Time: About 5-7 Hours_x000D_Host Battery Type: 800mAh Lithium Ion Battery (Built In)_x000D_Remote Battery Type: 1 x CR2025 Button Cell (Not Included) Features: 1PLUG 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. 2STRONG 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. 3BLUETOOTH 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. 4EXTERNAL 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. 5MULTIFUNCTION 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. PackageList: 1 x_x000D__x000D_Bluetooth5.1SoundReceiverTransmitter 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