For the LS series. Product features: Can also be used as a secondary signaling device (bell). Call and floor call functions. Polarity-safe 2-wire installation (J-Y(St)Y 2 x 2 x 0.8). Parallel connection (simultaneous calling) of up to 4 audio modules or audio indoor stations (from the 3rd device, the Siedle BPS is required for programming). High-quality sound and great speaker dynamics. Electret condenser microphone. Connection for Siedle In-Home Bus. Connections for floor call buttons and additional modules. Call generator with 11 ringtone melodies, including gong. Ringtone volume adjustable in 5 levels up to 92 dB(A). Speech volume adjustable in 5 levels. Programming manually, Plug+Play, and via Siedle Bus programming software (BPS), according to the Siedle system manual. Automatic call acceptance for internal calls.