1. Operating system: No operating system, runs immediately upon power on, 485 interface,

2. Total volume adjustment, input/output volume adjustment for each channel, archive call function (86 boxes)

3. Display screen size: 1.5 inches

4. Resolution: 240 * 240

5. Voltage: 1.8-5.5V DC

6. Communication interface: RS485

7. Effective screen display size: length * width=35mm X 31.5mm

8. Product dimensions: length * width * height=86mm X 86mm X 32mm

9. Working temperature: -20~70 degrees Celsius