The PRX Proximity Voltage Detector is a non-contact detector with nine standard voltage ranges from 120V to 500kV. When voltage is detected, the PRX-500 gives an audible and visual indication with a typical detection distance of 10 inches. The PRX has the ability to detect voltage on most elbow test points at the 120V setting. With a rechargeable internal battery, the PRX can be charged quickly from 12VDC automotive outlets or from 115-240VAC.