Easy to install wireless door bell system with 8 melodies for choice. The ringing display functions optically via three blue LEDs. The system is expandable with an additional sender (z. B. order No. 61 08 04) & with several recipients (z.B. order. No. 61 07 96 order 61 07 97). The system has an automatic training-coding. The connection is possible at available door-bell. The ring tone is switched-off for rest phase. Control light informs about the battery status.