Plenum-rated 2-ch I/O box with logic Alternative to standard switch boxes for impractical areas such as floor pockets or above ceilings 2 balanced Mic / Line / Line-Plus inputs and 2 balanced line outputs on Euroblockconnectors 2 Logic Inputs and Outputs interface other devices to HAL with toggles or commands, such as push-to-talk or mute switches, projectors, lights, alarms, etc Dimensions 12.5 x 8.4 x 2.7 cm