Bosch D-TECT-120-RT Lithium-Ion Wall and Floor Detection Scanner (Certified Refurbished) This Certified Refurbished product has been tested and certified to work and look like new, with minimal to no signs of wear, by a specialized third-party seller approved by Amazon. The product is backed by a minimum 90-day warranty, and may arrive in a generic brown or white box. Accessories may be generic and not directly from the manufacturer. Spot measurement instead of procedural measurement enables detection on extremely small surfaces Center finder provides visual direction guidance for precision locating of the object's center Detects objects up to a material depth of 4-3/4 in. Audible and visual warning signals when objects are detected in the wall