4 push buttons with blue or orange lighting with USB.
USB plug in component (included in the basic version) for connecting a compatible accessory (telephone, etc ...) to connect it to a 5v power adapter (connecting cable included), or access to housing FP5 for an update.
Scalable configuration according to your needs. We will determine in this case the cost in each case.
Optionally the pushbuttons can beings individually coupled to a "bistable" Relay interface for controlling an organ requiring ON / OFF permanent function (eg switching to 200hp or not) or a "shot" Relay interface for controlling an accessory requiring a single pulse (for example: portal remote).
Example configuration using three interfaces ON / OFF momentary ON eth1 interface: