Feature: 1. The product support null and firing line detection, simple operation and clear display 2. Under normal circumstances, when an analog bright red three-segment signal, the electric pen detects a firing line; when an analog bright green three-segment signal is inside, the electric pen detects a null or ground line 3. Electric pen come with sound and light alarm, rapid alarm sound and light flashing 4. Long press the blue button to turn on the flashlight lighting, which is convenient for easy measuring in the dark environment 5. After about 3 minutes of no induction signal or no operation, the tester will automatically shut down. When the battery voltage is low, the sensor light of the tester will light up once and then automatically shut down Specification: Item Type: Induction Electric Pen Model: TA881A Non-Contact Induction Voltage Range: 12-1000V, 50/60Hz Working Temperature: 0-40℃ Storage Humidity: -10-50℃ Storage Humidity: ≤95% Altitude: ≤2000meters Power Supply: 2 x 1.5V AAA batteries(not include). Package List: 1 x Induction Electric Pen1 x User Manual