Ben10m-tfr :-through-beam, sensing distance : 10mtr., power supply built-in relay contect output. ben10m-tdt :-through-beam, sensing distance : 10mtr., dc power soilid state output. Ben5m-mfr :-retro reflective, sensing distance : 05mtr., power supply built-in relay contect output. ben5m-mdt :-retro reflective, sensing distance : 05mtr., dc power soilid state output. Ben3m-pfr :-retro reflective(with polarizing filter) , sensing distance : 03mtr., power supply built-in relay contect output. ben3m-pdt :-retro reflective(with polarizing filter) , sensing distance : 03mtr., dc power soilid state output. Ben300-dfr :-diffuse reflective , sensing destance : 300mm , power supply built-in relay contect output. ben300-ddt :-diffuse reflective , sensing destance : 300mm , dc power soilid state output.