The Everspring EVR_SP814 Z-Wave motion detector can be triggered by movement or changes in light level, allowing it to be used as a security and home automation sensor.
Monitors changes in infrared level and movement that indicate a person’s presence. Once detected, the unit sends an alert to all the Z-Wave devices it is associated with.
Measures a room’s ambient light level (lux) allowing it to trigger an event when the light level below a pre-set level. For instance, when the room is dark and movement is detected the unit signals to the controller to turn the room’s lights on – lights come on automatically when you walk into a room.
– See more at: http://www.everspring.com/en/portfolio-item/sp814-lens-changeable-pir-detector/