NOTE: Zero line=neutral wire (N) Fire wire=live wire (L) Zero FireWire=N,L Wire Features: 1. Rotary battery cover, easy to re-battery. 2. Automatically distinguish the neutral wire (N) from the live wire (L). 3. Sound and LED Alarm 4. Automatic selection of three sensitivities. (High, medium and low) 5. Small and compact pen, easy to carry. Description: 1. Professional AC voltage detector with non-contact test. 2. AC Voltage Sensitivity Adjustable 3. Light Sound indication, automatic power off. Specifications: Model: AC1010 Color: Black Material: ABS Working environment: 0-40& 8451; Storage environment: -10-50& 8451; Humidity: < 85% RH Battery type: 2x1.5v AAA Battery(not included) Voltage sensitivity: 12V-1000V AC Frequency: 50-60 Hz Alarm mode: light sound Flash: White Automatic shutdown: Yes Weight: 32g Product size: 155*20*20mm/6.1*0.79" Weight: 47g Notes: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you 2. Please allow slight measuring deviation due to manual measurement. Packing list Package: 1*Sensor Pen(NO Battery)