This is a servo (or battery) adaptor to convert AIR STD servo (or battery) to a Z-series receiver (or switch harness). This is an intermediate cord with a female AIR STD socket on one end, and a male Z-series plug on the other end. INCLUDES: One adapter, with Blue Z male plug, 2" of wire which is obviously crossed to mate properly with the Black AIR STD black servo jack socket. REQUIRES: Servo with AIR STD plug (NOT Z, JR, or J) and a receiver which has Z sockets (JR, J, or new Airtronics Z receivers). COMMENTS: "Z" is Airtronics new plug as of 1998 which is compatible with JR, Futaba, Hitec. "AIR STD" is the old "Black" Airtronics jack which was shaped and wired differently. Airtronics has a whole new line of servos with Z plugs, which CAN NOT be plugged into their old receivers but CAN be used with JR, FUT, and their new Z receivers. EXAMPLE: This adapter would be used when a customer has an Airtronics servo and wants to plug into Futaba/JR/Air Z receivers. AMC 4/2/98