1. AC Voltage Range: 12V ~1000V(Manual Mode) / 48V ~1000V(Auto Mode)
2. Frequency: 50Hz/60Hz
3. Alarm mode: Sound and light
4. Zero line/fire line judgment: According to the strength of the signal the strong signal is fire line.
5. V~Aiert sensitivity: automatically select 3 kinds of sensitivity (high medium and low)
6. V~Aiert signal strength indication mode: high (red) medium (yellow) and low (green) signals are indicated by different alarm sounds and different color LED lights.
7. Operating temperature: 0-40 degrees Celsius
8. Storage temperature: -10~50 degrees Celsius