Before you start drilling in a wall it might be a good idea to check for any wiring. There's no cord to restrict you, just make sure you've charged the battery.
From Amazon
Bosch Professional12VD-tect System120 Wall Scanner D-tect120(withoutbattery,max12detection Depth Plastic Pipes/Wooden Studs/Live Cable/Magnetic Metal/Non-Magnetic Metal:60/38/60/120/120 mm,in L-Boxx)
Conrad Electronic
Bosch Professional Detector D-tect 120 0601081308 Locating depth (max.) 120 mm Suitable for Ferrous metal, Wood, Plastic, Non-ferrous metal, Live wires