In the name of Allah, and peace and blessings be upon the Messenger of Allah, may Allah's prayers and peace be upon him. *** BOSCH 120 GMS device. A device for detecting metal, wood, or electrical wiring inside walls, whether block, concrete, or gypsum. If you want to drill into the wall, this device detects for you through an open circuit if there is something inside the wall before you drill. It gives you colored warning lights and an audible warning. Its price on Amazon is 860 SAR. Asking price is 500 SAR. The device is clean and guaranteed, like new.