iZtouch -2 Packs - Universal 433MHz GSM Wireless Magnetic Contact Sensor Window Door Entry Detector For Home Office Security Alarm System, Accessories for Wireless 433MHz IP Camera

comes with zero intructions

Simply does not work, got two sensors, tried two different 433MHz units and neither could pair with these sensors, not sure what's up but my guess is that I didn't receive a 433mhz sensor