Remote On/Off Key Switch f/701-MD & 720-MDO Battery Switches. The remote On/Off key switch is used for the remote operation of the 701-MD and 720-MDO battery switches. It can be mounted stand alone or within the Contour Connect panel range.WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.