I was just looking at Production Intercoms website, and I came across this new type of wireless system- Half-Duplex. There are one or two disadvantages, but it is cheaper, and if you are only using one or two wireless there are barly any disadvantages. There are also many perks too.... for instance, it does not eat up as many channels as full-duplex systems do. Below is a section I copyed from their website- There is a diagram as to how they work at- http://www.beltpack.com/HD903-diagram.pdf Cool stuff- What do you all think? Has anyone used this?