On/off switch avoids nuisance buzzing and extends battery life
Supplied with batteries
Specification: Indication: 1 LED, buzzer Voltage range: 50 600 V AC Frequency: 50-500 Hz Overvoltage category: Cat 111/600 V Power supply: 2 x 1.5 V AAA batteries
Contact-free optical and acoustic indication of AC voltages between 50-600 V