1. Integrated receiving and transmitting (default transmitting mode, no pairing password, switchable receiving mode)2. Call function (receive function)3. Serial AT control4. Serial port AT to modify bluetooth name (receiving function)5. Prompt tone (neutral tone = drip or electronic tone) (receiving function)6. Support long press the "MODE" key to turn off, short press the "MODE" key to turn on, the consumption is very lowAll controls support serial AT commands, which are very powerful.TYPE:Bluetooth V5.0 Stereo BK3266 Modulecolor:BlueMaterial:PCBPackage Contents:1 x ModuleOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.