Usage Tips:Item Type: Voltage Tester Model: AN101 Material: ABS Battery: 1.5V AAA Battery x 2 Shipped Without Battery Basic Parameters: Alarm Mode: Sound and Light Alarm , Display Indication Lighting Flash Light: White LED Lighting Neutral Live Wire Judgement: According to the signal strength to judge, the strong signal is the live wire. NCV Seek Sensitivity: Can be toggled by the S key to the sensitivity. LCD Indicator Screen: Display red for the live line, Display green for the neutral line or ground line. Application Environment: Operating Temperature: Approx. 040 degrees Celsius / 32-104? Storage Temperature: Approx.-1050 degrees Celsius / 14-122? Humidity: Less than or equal to 95% Altitude: Less than or equal to 2000m Safety Class: CAT.III 1000v CAT.IV 600v CE Package List:1 x Digital Display Pen 1 x Manual