This is a single relay that can be triggered by the MTT Precision Detector. It needs either a 5VDC or 12VDC power supply(so does the detector) so we recommend our 5V or 12V Power Module.
The switch side of the relay has both Normally Open and Normally Closed connections, plus a common. You can switch up to 8Amp/125VAC or 28VDC.
** We DO NOT make this relay and it is readily available elsewhere. We provide it for sale as a convenience and we don’t make a profit. However we tested this one for compatibility so we know it works.