Do you want to start drilling, but realize that the battery of the Bosch D-TECT 120 has run empty? Don't worry! The detector works on both an internal battery and external batteries. This way, you'll never start drilling unprepared. If the D-TECT 120 detects electrical cables, water pipes, or other objects, it will alert you by giving off an audible and visible warning signal. The straightforward buttons that allow you to choose different types of measurement make this radar scanner very user-friendly. Thanks to the precision measurement, the pipe locator also works in the most confining spaces.