Greenlee Voltage detector use to detect voltage in low voltage applications ranging from 12 - 90 VAC. It has frequency range of 50 - 500 Hz and includes 1.5 Volts AAA batteries. It has safe non-contact voltage detection and indicates bright LED and audible alarm if voltage is present. It features on/off switch for longer battery life and is convenient pen-size device easily fits into pockets or tool pouches. Voltage detector is C/US UL listed and CE certified.