Features 1、APPLICABLE DEVICES: HiFi Bluetooth receiver transmitter for transferring excellent music from your cell phone, computer or tablet to any of your home stereo system via Bluetooth. It can also transfer music from your TV, computer, projector, amplifier to Bluetooth headphones or speakers (automatic proximity connection), plug and play, easy to use. 2、BLUETOOTH 5.1: Adopting premium 5.1 chip ensures fast and stable Bluetooth connection. We support ports for AUX, coaxial, microphone connection, also support USB flash drive, memory card to play music, powerful compatibility to meet your daily music experience. The Bluetooth sound adapter is designed with a variety of function indicators, more intuitive to see the functional status of the product. 3、CONNECT TO APP: Our Bluetooth receiver has been technically upgraded. For GTMEDIA Connect is an app for this model that allows you to operate various functions from your phone via Bluetooth. You can download and install the app from for Play Store and App Shop to experience more of our products. 4、SIMPLE TO USE: After the sound device is successfully connected, connect the Bluetooth receiver to the successful speaker via AUX sound cable to enjoy HIFI music, and you can switch between different modes at will, such as USB mode, microphone mode, coaxial sound conversion mode. It also supports remote control (included) to adjust volume up/down, up/down tracks, connect channels. 5、WIRELESS CONNECTION: The wireless sound adapter allows for a more stable connection with your device, external antenna design reduces signal interference and can receive Bluetooth signals within 15m. Built in 800mAh high capacity battery, only about 2 hours of charging time, can provide up to 5‑6 hours of playback time, perfect for traveling and carrying with you. Specification Item Type: Bluetooth Transmitter Receiver Material: Aluminum Alloy Bluetooth Version: 5.1 Frequency Range: 2400‑2483.5MHz Frequency Response: 20Hz to 20KHz Function Mode: Bluetooth Receive, Bluetooth Transmit Transmission Distance: About 15m SNR: ≥75db Sound Performance: SBC AAC Decoding Interface Type: USB Port, Memory Card Slot, AUX Input and Output, R/L Output, Coaxial Input, MIC Input Peripheral Support: U Disk, Memory Card (Maximum Support 128GB, Shipping Does Not Include) Use Time: About 5‑6 Hours Device Battery Type: 800mAh Lithium Ion Battery (built In) Remote Control Battery Type: 1 x CR2032 Button Cell (not included) Size: Approx. 12.8x6x2.8cm / 5.0x2.4x1.1in Package List 1 x Multifunction Bluetooth Sound Adapter 1 x Cable 1 x 3.5mm Sound Cable 1 x Antennae 1 x Type C Charging Cable 1 x Remote Control 1 x Instruction Manual