Linear DT4, dnt00027b Linear DT4 four button remote, 310 mhz, 8 switch, visor style The DT-4A 4-channel Visor Transmitter is a wireless radio control designed for use with automatic garage/gate operators and access control systems. The transmitter can be used with one four-channel receiver (DR4), two two-channel receivers (DR2) or four single-channel receivers (DR, DRQ or DRM). Features Activates four separate Delta-3 receivers Can also be used as remote UP, DOWN, and STOP control for commercial operators Test/operate LED Visor mounting clip supplied Power: 9 V battery Frequency: 310 MHz Codes: 64 (set by dip switches) Dimensions: 2.16 x .95 x 3.75