The wall switch occupancy sensor(SK901IE),is designed to replace the normal ON/OFF wall switch.It will detect motion from any heat-emitting source(such as a person) within its field-of-view(the area of surveillance).After the primary detector(PIR) senses presence and engages then microphonics(the sound detection system) comes into operation to keep the status of the detector as "Occupied" even though there is no detected motion but if any sound.The controlled lights will remain ON until no motion/sound is detected and the pre-set time-delay has expired. ELECTRICAL Line Voltage 120/277VAC Operational Frequenciea 60Hz Wire Designation Line-Black, Load-Blue Ground-Green,Neutral-White Load Rating Fluorescent:1200VA-10A/120V 2700VA-10a/277v Incandescent:800W-6.67A/120V Inductive Load:1/4hp(185W)-5.8A/120V Minimum Load 10mA ENVIRONMENTAL Operating Temperature Rang 0°C to 50°C Storage Temperature Range -10°C to 85°C Relative Humidity 20% to 90% non-condensing Agency Approval ETL/UL Listed/CSA Certified Complies with California Title 24 Energy Code Complies with FCC Regulations ORDERING INFORMATION SK901IE PIR sensor+microphonics Earth required SK901IN PIR sensor+microphonics, Neutral required SK901UN Ultr sonics+microphonics, Neutral required