1. When the parking space is less than 10, the number is displayed in red, and the number greater than 10 is shown in green 2. Communication mode: RS485 @ 9600bps 3. Communication distance: ≤ 300m 4. Display size: 608 * 152mm 5. Appearance dimension: 700 * 200 * 90 6. Working temperature: - 20 ℃ ~ + 65 ℃