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Features: 1. Bluetooth version: With BT V5.0, it has excellent wireless performance (backward compatible with BT V3.0 and V2.1). 2. Use: Prepare memory for the paired device. 3. The transmission distance is more than 33 feet, the full charge can last for 15 hours, and the US dollar charging line takes 2 hours. 4. Integrated solution for BT reception and transmission. 5. Wide range of applications: Applicable to all devices (smartphones, headsets, speakers, etc.) on any version of Bluetooth on the market, including: Bluetooth 1.0 / 1.1 / 1.2 / 2.0 / 2.1 / 3.0 / 3.1 / 3.2 / 4.0 / 4.1 / 4.2 / 4.0 and so on. Descriptions: 1.RX mode: Easily pair with BT-enabled smartphones, tablets, desktops and laptops. 2.TX mode: Easy pairing with BT headsets, earbuds, speakers and other BT audio systems. Plug and Play - no drivers or software required. Startup: The audio port is immediately plugged into the 3.5mm audio cable (blue light, green light flashes at the same time). Paired connection: 3.RX mode pairing: Turn on BT to select "RX" receive mode and enter BT pairing mode (blue light flashes). Open the phone ""Settings"" and search for the BT device to find the BT device ""DL-LINK"" to select and Pair the connection. The connection is successful (the blue light is slowly flashing). 4.TX mode pairing: Turn on B, select the "TX" startup mode, and then enter the BT pairing mode (the green indicator light flashes). Turn on the BT receiving device (BT speaker, BT headset, etc.) and wait a few seconds. BT and the receiving device will be connected automatically (the green indicator light flashes slowly). 5.Mode switch: Switch the TX button to switch to the send mode, and the 3.5mm audio port is "input". Switch the RX button to switch to receive mode and the 3.5mm audio port is "output". Specifications: BT version: BT 5.0 Battery capacity: 3.7V / 300ma working time: 8-12 hours Charging current: 120mA, 2 hours fast charging frequency response: 20Hz~20KHz Rated input: DC5V 500mA sensitivity (SPL): 100 + - 3dB The light indicates: On: The blue and green indicators flash once. Charging: Red light, full charge: On. RX mode pairing: The blue light flashes quickly; the pairing is successful (the blue light flashes slowly). TX model pairing: The green light flashes quickly; the pairing is successful: the green light flashes slowly. Shutdown: Pull the audio cable out of the audio port; if it does not match for a long time, the device will automatically turn off. Color: black Size: 42*42*13mm Package included: 1 x 5.0 Bluetooth adapter 1 x3.5mm audio cable 1 xUSB charging cable 1 xRCA line 1 xInstruction manual