Velleman Metal Detector K7102 - Quantity 14 Wholesale - Total 14 Item specifics: Brand - Velleman Type - METAL DETECTOR MPN - K7102 Size - 6.1" x 4.92" x 1.57" UPC - 836479009691 Item description from the seller: To come up against an electric cable while drilling a hole in a wall can have catastrophic consequences. Likewise, drilling into gas, water pipes or central heating pipes can be extremely hazardous. With a handy metal detector it can now be determined beforehand whether there are metal objects to be found in a wall, ceiling or floor. An LED indicates if a metal object is in the vicinity. If an audio signal is also desired, space has been provided on the PCB for buzzer type SV4/12-S to be connected. The PCB has been specially constructed to fit entirely into to the separately available box type G407.