1. Installation aperture: 22mm
2. Voltage application range: AC220-380V
3. Timing range: 0-60M; 0-999H
4. External function button: Short press to pause, long press to reset
5. Display resolution: 60 decimal point flashes, accumulating 1M digits
6. Sampling rate: about 1 time/S
7. Input circuit power consumption: ＜ 1VA
8. Prompt message when there is no signal input: 0
9. This product is prohibited from use in electrical environments with variable frequency, high frequency, and harmonic interference