Feature: 1. REAL TIME COMMUNICATION: Wireless intercom system allows for clear and reliable real time communication, with full duplex monitoring, group calls, and crystal clear sound quality for excellent conversation. 2. 2KM LONG RANGE: With a range of up to 2km in open space, our wireless intercom system is perfect for indoor or outdoor use. It's a simple and effective solution for all your communication needs. 3. CLEAR LED DISPLAY: Equipped with LED screen, wireless intercom system is incredibly user friendly and provides a clear display during usage. It is suitable for home or office use. 4. CRISP SOUND QUALITY: Wireless intercom system provides clear and crisp sound quality, ensuring reliable and secure communication, which interference free and provides stable communication. 5. VERSATILE USAGE: Wireless intercom system is ideal for a wide range of scenarios, making it a perfect fit for business, office, and home use, which provides clear and reliable communication. Specification: 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 to Use 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. . Package List: 1 x Wireless Intercom1 x Instruction Manual1 x Sticker1 x USB Cable Note: Sub intercom and Sub intercom cannot make calls to each other