Sinthesi S2 additional module for telephone entry panel for numeric keypad

Additional numeric keypad module to be connected to the main units cod. 1148/1 or cod. 1148/2 to call an internal extension, or a speed dial either by typing the corresponding telephone number or by typing 2 digits, between 01 and 99, corresponding to the position in the address book of the same extension, or it allows you to operate an electric lock by entering a code up to 6-digit.