Walkera Devention 12 Channel Transmitter, purchased in a bulk buy. I have used this Tx on a Walkera Heli to test it and learn to program it. It is easy to use and I believe it can be converted to Spektrum format with Open Source code. It comes with a case. The antenna mount has a crack but works OK. I have found new ones on the web, but have not purchased. Receivers are available easily. Very comfortable to use. Battery seems good. Make an offer, may include shipping, but pick up preferred.