The Sennheiser GA 3 (article 503167) is a 19-inch rack mount kit for Sennheiser's half-rack-width stationary wireless receivers and transmitters. Sennheiser lists it for the evolution wireless G3 and G4 stationary receivers and for the EW-D and EW-DX rack receivers. The kit lets you install either a single unit or two units side by side in one rack unit of a standard 19-inch equipment rack, so wireless receivers can live in the same flight case or install rack as the mixer, amplifiers and other gear. Sennheiser describes the kit as extremely robust and easy to install. It is black to match the receivers and typical rack hardware. Rental companies, touring engineers, churches, schools and conference venues use it to keep wireless receivers secure, neat and protected in transport, rather than sitting loose on a table. It carries Sennheiser's two-year warranty.