These AFI (American Fibertek Inc.) 4 channel Video Transmitters are used but they are in good to very good condition. They were removed from a working environment. I purchased these units from a state administration office and was assured that they were operational. For that reason I am offering my FREE 30 day return/refund guarantee on them. You would be purchasing 1 unit at a time for listed price. These units do not come with power supply's. I will post an overview, specs, and features below. As stated, these units are used and as such may contain some minor scratches, scuffs, stickers, and sticker residue. I do clean and disinfect my products before I pack and ship them but sometimes you just cant remove some stickers and residue. If you have any questions about these items please do not hesitate to contact me.