I can find a datasheet for this sensor?
It is a sonar sensor. Can't see any electronics. Is there a circuit on the back? If not, you will have to do a lot of programming to get it to work. If it has "Vcc", "output" "input" and "gnd" you are in luck as there is plenty of information in this forum.
Weedpharma
I think it's a SRF05 Ultrasonic Ranger.
hi, See info and example code here:
http://arduino-info.wikispaces.com/UltraSonicDistance