SELF TEST button to test battery and proper functioning of HV detector. Powered by a single 9V Battery type (6F22), Easily replacement on field. Type tested at CPRI. Colour code models for different voltage levels. Contact and Non contact Type Probe. Indicates the presence of HIGH VOLTAGE by audio as well as visual annunciation. Bright high intensity RED LED'S provide clear visual indication even in unfavorable daylight conditions. A buzzer produces a loud beep which is audible even in loud noisy backgrounds. Supplied as a complete Kit with HV Detector Probe, Telescopic Insulation stick and Ergonomically designed sturdy Carry bag.