This item does not have any warranty, selling untested as is. Return will not be accepted. 

MK7 Oil Mist Detector Control Unit.

The MK7 is an auto addressed Oil Mist Detector (OMD). can monitor up to 10 Detectors heads per control unit, on up to 10 control units. Each of the Detector heads monitors a single crank space. The engine mounted control unit can be configured to monitor 1 to 10 Detectors. Alarm levels and alarm output requirements are all set from the control unit, or from the optional display unit.