Fast and easy results - The Truvo detection device is the simple solution for scanning walls and ceilings to locate metal objects or electrical cables. It enables safer drilling when hanging pictures or installing lamps. An LED traffic light system and an audible alert indicate where drilling should not occur. For even better results, LEDs with symbols for metal and electrical cables show what the detection device has specifically found. Thanks to a single on/off switch and automatic calibration, you can start locating immediately. A language-neutral quick start guide with simple graphics is included for accurate results through proper handling and a quick start with the tool.