Wireless Intercom System 2km Long Range LED Screen Room to Room Sub Master Intercom Communication Item Type: Wireless Intercom Maerial: ABS Built in Battery: 2000mAh Lithium ion Battery Volume Level: 7 Levels Communication Distance: Up to 2km in open space Host to Host Intercom: All hosts can call each other Host to Sub intercom: Host can call sub intercoms170 How e Step One: Setting the ID Number for the Host  1. Press and hold the Settings key for 3 seconds until a beep is heard.  2. The screen will display "1."  3. Press the <OK> key and "<ID: 999>" will begin to flash.  4. Use the keypad to input the desired <ID> number (0 is between 1 and 998).  5. Press <OK> to confirm and an audible "dudu" sound will indicate that the <ID> number has been set successfully.  Step Two: Setting the Same Channel "CH" for the Host  1. Press and hold the Settings key for 3 seconds until a beep is heard.  2. Press the upward arrow key <^> once and the screen will switch from "1" to "2."  3. Press <OK> and "<CH: 01>" will begin to flash.  4. Use the upward <ヘ> or downward <v> arrow key to adjust the channel <CH>, selecting a channel number between 01-20.  5. Press <OK> to confirm and an audible "dudu" sound will indicate that the channel <CH> has been set successfully.  Step Three: Setting the Same Password for the Host  1. Press and hold the Settings key for 3 seconds until a beep is heard.  2. Press the upward arrow key <^> once more and the screen will switch from "1" to "3."  3. Press <OK> and "<000>" will begin to flash.  4. Use the keypad to input the desired <password>, a three-digit number between 001-999.  5. Press <OK> to confirm and an audible "dudu" sound will indicate that the<password> has been set successfully.