We originally designed this harness for F.E.M.A. communications specialists who often have to carry two incompatible radios. Our customers rapidly realized that the extra radio pocket easily fit a cell phone or G.P.S. unit, making this a highly popular item. Both pockets adjust in length and girth just like the Adjusta Pro, so you can put your primary radio on either side. There is a center pocket for back up batteries, swiss knife etc. The harness platform adjusts and rides exactly like the legendary Adjusta Pro.