Product Parameters:  Default specification: Neutral English,  Bluetooth version: V5.0 AP-X, HD, low latency,  Bluetooth chip: CSR8675,  Frequency range 2.402GHz-2.480GHz,  Receiver mode working time: unlimited time ( plug and play ),  Transmitter mode working time: unlimited time ( plug and play ),  Communication distance: RX: 120M, TX: 120M,  Bluetooth protocol: A2DP, AVRCP,  Codec: AP-X HD, AP-X LOW LATENCY, AP-X, SBC,  Power supply mode: Type-C interface,  Working temperature: -10℃-55℃,  Product net weight: 88g,  Product size: 138mm*100mm*240mm,  Packing size: 206*130*58MM,  Gross weight: 300g,    Launch Mode Operation:  1. After the Bluetooth adapter is connected to the power,  2. Long press the power button for 3S,  3. Press the M button to switch to TX mode, double-click the A/B button of the Bluetooth adapter to switch the pairing mode and turn on the headset/speaker Bluetooth pairing mode after successful connection,  4. Double-click the A/B button again and then turn on the second headset/speaker to the Bluetooth pairing mode to connect and pair,  5. At this time, the number of connections displayed on the TX interface of the Bluetooth adapter is 2 which means that both devices are successfully connected and support synchronized playback of music,    Receive Mode Operation:  1. After the Bluetooth adapter is connected to the power,  2. Long press the power button for 3S,  3. At this time, the Bluetooth of the Bluetooth adapter is disconnected, and then turn on the Bluetooth of the second mobile phone,  Double-click the A/B button of the Bluetooth adapter to switch to the pairing state. After the connection is successful, turn off the Bluetooth function of the second mobile phone again, and turn on the Bluetooth adapter. Shut down,  4. Turn on the Bluetooth function of the first and second mobile phones at the same time (just paired), and then turn on the Bluetooth adapter. At this time, the adapter will connect back to automatically pair with the Bluetooth of 2 mobile phones, and the RX interface will display the number of connections as 2 Indicates that the two mobile phones are successfully connected,