Greenlee is the leader in electrical testing and measurement and has been for more than fifteen years. Greenlee's innovative products are designed to withstand the rigorous tasks and harsh elements known to be found on the jobsite. This means with Greenlee, you have tough and reliable tools that make your job faster, safer and easier. The Greenlee GT-15 non-contact low voltage detector is used to detect voltage in low voltage applications ranging from 12-90-Volt AC. Safe, non-contact voltage detection. Bright LED and audible alarm if voltage is present. on/off switch for longer battery life. Convenient pen-size device easily fits into pockets or tool pouches. Accessories included: (2) 1.5-Volt AAA batteries. Lifetime limited warranty.