1: What is the diference between a human presence sensor and a PIR movement sensor? The sensible human presence sensor acts as more touchy and with extra essential points in APP to elucidate the which means of domestic safety in a true sense than a PIR motion sensor,even can precisely hit upon the static state akin to staff 2: Does the human presence sensor favor hub (gateway)? Yes, it's produced with ZigBee protocol which is Tuya ZigBee hub required. Performing since the middle bridge for all Tuya ZigBee smart instruments with extremely regular signal and a really nice necessity for whole-house intelligence.(note:Tuya ZigBee hub is incredibly recommended for its wider compatibility than assorted hubs) 3: Can I set the maintain time to guarantee its ideal detection function?Yes, there may be the preserve time set out there in APP for far extra appropriate detection.