The 701 Contour Battery Master Switch is a simple on/off switch which offers a number of unique Features. The contour lock system allows it to be a stand alone unit or locked together with other switches. The 701 also Features a control knob which cannot be removed whilst in the on or off position, however can be removed by switching to an anti-theft position. Interchangeable labelling system on the control knob allows a full range of applications. Switches come standard with the battery symbol label.