Review on ENERLITES MDC-50L Ultrasonic And PIR Dual Technology Occupancy Sensor, 360 Degree Field Of View, 1600 Sq Ft Coverage, Low Voltage Commercial Grade - White by Mike Wheeler

Bought and installed this unit on an 8' high ceiling. The device only turns the lights on when the 'motion" is within 8' or so of the device. I have tried adjusting the settings on the unit but it does not make it better. I have also tested this performance failure from several different approach angles and all work about the same, that is to say at roughly 8' from the unit. I need it to activate at roughly 15'. On top of that the device installs into the electrical box, so if your box is at all crowed you will likely need to install a box extender to fit this unit into you box. I did.I would not recommend this unit.