2 relays for external chimes or signal.

Spare device with 2 N.O. 3 A 230 V~ relays for the activation of external ringtones or indications such as repetition of a call from the entrance panel for the first or second push button, for connection to the Due Fili bus, installation on DIN rail (60715 TH35), occupies 4 modules size 17.5 mm