This is a set of two. Wireless dual-flash photography is possible. I purchased these new last year. I no longer need them as I am now using Godox, so I am selling them. Everything is shown in the first photo. One instruction manual is missing. There is a stain on the box (see photo 3). I think they are in good condition, but please understand that they are used and purchase accordingly. No returns, no refunds. Please refrain from price negotiations. LightPix Labs wireless flash system Black Flash Strobe