The MT403 is a Non-Contact AC Voltage detector with dual ranges, a low measuring range down to 12 volts and a high measuring range from 12V to 1000V. Suitable for outlets or against wire insulation testing, this non-contact AC Voltage Detector has a switch to turn the unit on and a Green LED indicates it is working. There is a Red LED and an audible sound to indicate the presence of voltage. It has a rugged double moulded IP67 waterproof housing that can withstand a 2m drop. There is a bright built-in LED flashlight ideal for use in dimly lit areas. Features : 12V to 1000V detection Thinner probe tip for working with socket outlets Green LED means Power on, flashing red LED with beeper means Voltage detected Two modes, green indicates high voltage mode, Yellow LED 12V Mode Flash and beep rate increases as the detector gets closer to the voltage. Power On/Off with silent mode IP67 waterproof and withstand a 2m drop-proof CAT IV 1000V