UT11B Non-Contact Voltage Pen AC Detector Live 50 ~ 600V AC (UT11B) Detects AC voltage without metallic contact. Voltage detecting range: 50 ~ 600v AC. Both audio and visual alert (Red LED flash + beep). With On / Off switch. Auto power off. Full non-metallic material. Meet Safety Stanard IP54, IEC1010 Powered by 2x 1.5v AAA batteries. Batteries included.