This quick change triggers the detection. As an object, such as a human, passes in front of the background, such as a wall, the temperature at that point will rise from room temperature to body temperature, and then back again. PIR Sensors do not detect motion, instead they detect abrupt changes in temperature at a given point using the Infrared radiation level. What is the difference between normal Motion Sensors and PIR Sensors? They are more commonly used in burglar alarms and automatically-activated lighting systems. A PIR-based motion detector is used to sense movement of people, animals, or other objects. PIR sensors don't detect or measure heat, but instead they detect the Infrared radiation emitted from an object. Usually this radiation is invisible to the human eye because it radiates at infrared wavelengths, but it can be detected by PIR Sensors. All objects with a temperature above zero emit heat energy in the form of radiation. A PIR Sensor is an electronic sensor that measures infrared light radiating from objects in its field of view. We always recommend that you use high quality branded alkaline batteries. As an example, based on batteries with a capacity between 500-1000 mAh, a 5 second message will playback between 3,600 and 7,200 times. Battery Life: This will depend on the mAh rating of the batteries that you install.Note: Recording time can be doubled to 8 minutes by changing the MP3 file sample bitrate to 64kbps.Recording time: Approx 4 minutes, (calculated at 128Kbps MONO bitrate).Volume Level: 90 dB maximum, (depending on original recording).Sensor activation distance: Up to 4 metres with a 120 Deg Angle.File transfer using the built-in Micro USB socket and cable supplied.Micro USB Socket to support a 5 Volt DC Power Adapter.Multiple Track Mode will NOT playback randomly.In Multiple Track Mode one track will play after each activation, (in file name order).Two playback settings: Single Track or Multiple Tracks.Two power supply options: 3 x AAA Batteries or Mains Power Adapter, (bought separately).Includes an optional wall mounting bracket.Three volume settings: Low, Medium and High.Store multiple MP3 files or voice recordings to enable a looped playback.Automatic audio playback after the PIR sensor has been activated.Update and change your messages as many times as you wish.Option to download your own MP3 sound files.Record your own speech, music or sound effects using the built-in microphone.Raise attention and create impact by adding a speech, music or sound effects to a point of sale display.Create a special door entrance greeting.Audible reminders or procedures to assist people with Dementia.Create an audible warning for a restricted area.Easy to use, step-by-step instructions included. Your voice recordings or MP3 file(s) will playback automatically after the PIR sensor has been activated. Simply transfer your MP3 sound files directly onto the internal memory via the USB socket. Our PIR Motion Sensors also have a unique MP3 file download feature. Record and playback your own speech, music or sound effects using the built-in microphone and speaker.
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