The input board has 32 LEDs on it along with the switches to turn on each bit on or off. In total, 96 relays are used and you can hear them clacking on and off in the videos on the page.

it relays them from the switch's input port to the output port, hence the name. Attachment to a frame relay network is made via a FRAD on the customer's premises, which may be a separate device or ...

Multi-input/output: support up to eight channels of switch signal input and eight channels of output control over electrical appliances Remote control by Smart Pro APP or indoor monitor 280M-S3 ...