The walkie-talkie module DEMO demonstration board is used to test the SA818S wireless walkie-talkie module. Users can use it to debug programs, test functions and distances, etc. Industrial-grade application U segment (400-480M) Working mode:1) Normal receiving mode: can receive language signals consistent with the current setting parameters;2) Normal transmitting mode: can send voice signals through the mark. SET button: the button to enter the setting mode, you can set a parameter currently displayed; if you set the last parameter, the button to jump out of the setting mode. UP /Down button:In the setting mode, the button to modify the corresponding setting parameters; In the normal display mode, the button to switch the displayed content, the order is:Transmit frequency - Receive frequency - Mute - Squelch - Volume - Bandwidth The parameter setting range is as follows:a) Transmit frequency: 400 - 480 MHz b) Receive frequency: 400 - 480 MHz c) Channel bandwidth: 12.5 KHz / 25KHz d) Mute: 0 - 38 levels (all channels can be received when set to 0) e) Squelch: 0 - 8 levels f) Volume: 1 - 8 levels PTT button: and hold this button to talk. High/Low push:Module high and low power selection switch. Note: There is FLASH inside, and all set parameters can be saved when the power is off. Color: green Material: ABS Package Contents: 1 x SA818S intercom test board 1 x speaker 1 x antenna Only 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.