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 CelsiusSpecification: Package Weight One Package Weight 0.12kgs / 0.27lb One Package Size 17.5cm * 6cm * 3.5cm / 6.89inch * 2.36inch * 1.38inch Qty per Carton 160 Carton Weight 18.30kgs / 40.34lb Carton Size 44cm * 38cm * 36cm / 17.32inch * 14.96inch * 14.17inch Loading Container 20GP: 443 cartons * 160 pcs = 70880 pcs 40HQ: 1028 cartons * 160 pcs = 164480 pcs