Single-family audio kit with Ultra external unit and Mini door-entry phone, Simplebus 1 wiring. The kit consists of: - n° 1 art. UT1010 - Ultra series audio module - n° 1 art. 2708W/A - Mini series door-entry phone with 2 buttons - n° 1 art. UT9172 - Surface-mounted housing for 2 modules, Ultra series, silver RAL9006 color - n° 1 art. UT9211 – Ultra series single button - n° 1 art. UT9279M - Ultra series electronic key module - n° 1 art. 1595 - Door-entry phone power supply unit