MRT rclaps.com PTX20 personal transponder £40
 

MRT PTX-20 transponder.
I had this in my touring car but having a big sell up.
I have used some sealant around the case to make water proof.
Full working order, wire in perfect condition.

£40 inc uk postage and paypal fees included.
http://img836.imageshack.us/img836/7703/sam0758g.jpg