Product parameters (to give you a better choice)           Model no. :TR-710 + TR-608    Type: hand-held          Frequency range: 433.92MHZ    Call range: 1 km          Power supply: rechargeable power supply    Color: white          Screen: Touch screen    Extension size: 15.5 x 9.5cm          Host size: 19.2 x 14.5cm    Scope of application: home office hotel           Extension details:  1. Indicator for sending or receiving messages  2. Turn on the loudspeaker when receiving the message  3. Built-in microphone for sound acquisition  4. Play button to view the last message  5. One-click communication with wechat  6. Table bracket can be fixed on the table  7. Power-on or power-off Settings  8. Power up  Main functions:  1. Call the main number  2. Obtain the call from the main phone  3. View the last call  Scope:  Frequency: 433.92 MHZ  Working distance: 1000m          Host details:  1. Antenna: Expand the distance  2. Built-in microphone for sound acquisition  3. Charge the power supply  4. Power-on or power-off Settings  Touch screen, easy to operate  6. Headphone jack  7. Two speakers  8. Equipped with support frame  Main functions:  1. The main station and sub-stations can talk to each other as simple as wechat  2. The master station can broadcast to all its sub-stations  3. You can look through old emails  4. The substation can view the last message  Scope:  Frequency: 433.92 MHZ  Working distance: 1000m  A main station can work with 200 substations    Remote restaurant radio intercom intercom  Products are widely used in: housing, offices, factories, teahouses, hospitals, schools, supermarkets, parks, cinemas and so on.