An oxygen concentrator system, comprising: a first oxygen concentrator apparatus, the first oxygen concentrator apparatus being portable and comprising: at least two canisters (302, 304); gas separation adsorbent disposed in the at least two canisters (302, 304), wherein the gas separation adsorbent separates at least some nitrogen from air in the canisters (302,304) to produce oxygen enriched gas; a compression system comprising at least one compressor coupled to the canisters (302, 304); and a first apparatus controller that controls the operation of the first oxygen concentrator apparatus; a second oxygen concentrator apparatus, the second oxygen concentrator apparatus comprising: at least two canisters; gas separation adsorbent disposed in the at least two canisters, wherein the gas separation adsorbent separates at least some nitrogen from air in the canisters (302, 304) to produce oxygen enriched gas; a compression system comprising at least one compressor coupled to the canisters; a second apparatus controller that controls the operation of the second oxygen concentrator apparatus using operating parameters stored in the second apparatus controller; and a coupling system that couples the first apparatus controller to the second apparatus controller; characterized in that the first apparatus controller is configured to be coupled to the second apparatus controller and to alter the operating parameters of the second apparatus controller. a first oxygen concentrator apparatus, the first oxygen concentrator apparatus being portable and comprising: at least two canisters (302, 304); gas separation adsorbent disposed in the at least two canisters (302, 304), wherein the gas separation adsorbent separates at least some nitrogen from air in the canisters (302,304) to produce oxygen enriched gas; a compression system comprising at least one compressor coupled to the canisters (302, 304); and a first apparatus controller that controls the operation of the first oxygen concentrator apparatus; at least two canisters (302, 304); gas separation adsorbent disposed in the at least two canisters (302, 304), wherein the gas separation adsorbent separates at least some nitrogen from air in the canisters (302,304) to produce oxygen enriched gas; a compression system comprising at least one compressor coupled to the canisters (302, 304); and a first apparatus controller that controls the operation of the first oxygen concentrator apparatus; a second oxygen concentrator apparatus, the second oxygen concentrator apparatus comprising: at least two canisters; gas separation adsorbent disposed in the at least two canisters, wherein the gas separation adsorbent separates at least some nitrogen from air in the canisters (302, 304) to produce oxygen enriched gas; a compression system comprising at least one compressor coupled to the canisters; a second apparatus controller that controls the operation of the second oxygen concentrator apparatus using operating parameters stored in the second apparatus controller; and a coupling system that couples the first apparatus controller to the second apparatus controller; at least two canisters; gas separation adsorbent disposed in the at least two canisters, wherein the gas separation adsorbent separates at least some nitrogen from air in the canisters (302, 304) to produce oxygen enriched gas; a compression system comprising at least one compressor coupled to the canisters; a second apparatus controller that controls the operation of the second oxygen concentrator apparatus using operating parameters stored in the second apparatus controller; and a coupling system that couples the first apparatus controller to the second apparatus controller; characterized in that the first apparatus controller is configured to be coupled to the second apparatus controller and to alter the operating parameters of the second apparatus controller.