Hand-held, 3-function detector locates the presence of metal, timber studs and joists, and live cables with both LED and audible signals. Adjustable detector sensitivity for improved accuracy. Requires 1 x 9V (PP3) battery. Includes calibration tool. Hand-held, 3-function detector locates the presence of metal, timber studs and joists, and live cables with both LED and audible signals. Adjustable detector sensitivity for improved accuracy. Requires 1 x 9V (PP3) battery. Includes calibration tool.