Here is a similar unit in the UK http://www.rs-online.com/designspark/el … an-arduino would not say that it is new… but…
This is very interesting topic . I also used to get detection using some IR sensors but it works only at midnight after I was in dream 
. But later I find this https://create.arduino.cc/projecthub/ru … ino-9f679c
which is quite interesting to work and learn about radio frequency.