Gives an audible & visual indication of both electrical & magnetic fields. Working Voltage range: 12 - 1000V AC. AC Frequency: 50/60Hz. Operating Current: =18mA. Pollution degree: 2 (accordance with IEC-664). Dielectric Strength: 2000V, 1 minute, 100µA or less during dielectric strength test. Operating Environment: 0° - 40°C (30° - 104°F). 80% RH mas. 50RG above 31°C. Batteries: 2 x 1.5V button type (LR44/AG13). CE & UKCA compliant.