Linear DT 3 plus 1, dnt00027a Linear DT 3 plus 1 four button remote, 310 mhz, 8 switch, visor style The DT3+1 4-channel Common Gate Access Transmitter is a hand-held four-channel transmitter with a three-channel section plus an individual one-channel section. It is designed so that channel 1 may have a system code independent of the other three channels. This transmitter operating in conjuction with four single-channel receivers, or one multi-channel receiver, can perform a variety of remote switching tasks. Dimensions: 2.16 x .95 x 3.75 inches