The AK-02 alarm contains an infrared motion sensor with a range of 60 degrees and electronics performing the range notification.
The infrared motion sensor (PIR) responds to infrared rays - for example body heat when entering the area of action
Mode I - presence notification when passing - music melody, 36 melodies can be selected with a button to change the volume
Mode II - off
Mode III - incoming notification when passing - greeting
Detector range 3-7m (60º)
Power supply battery AAA 3x1.5V or DC adapter 9V-15V/250mA
Volume> 60db