... distance:7-8m 3.PIR light high quality with competitive prices sensor pir led bulb light Quick ... use special sensor to detect the change of the infrared spectrum that human body releases, switch on automatically ... , delaytime is 60s,90s,180s(optional), not interfered with by outside noise, etc. It turns off when ... from heat or cold producers such as heater, air conditioner, microwave oven. 5. Indoor use ...