this is the Opter BX series sensors...the 2 far right ones, wireless and wireless.
wireless version can fit any brand of wireless contact.
this is a great choice for those looking for perimeter protection of slinging glass doors, long outdoor areas with multiple windows, in front of garage doors or driveways or whenever a photo beam cant be installed.
One BX can protect up to 80ft. (40ft in each direction) because it is installed in the center of the detection area and protects on both sides.