Basic Electronics multi a / b for 1 free phone up to 8 telephone systems (or major ports).

- For remote mounting.
- Universal housing (steel anthracite).
- With connection for up to 8 call buttons, 1 keypad (only for code lock), 1 speaker, 1 microphone. 8 a / b outputs.
- With 2 relays, 1 alarm input.
- Warning: 12V = power required (accessories: power adapter 20-9500).
- Dimensions (H x W x D): 240 x 160 x 65 mm.
Electronics:
- Connection to analog extension or connection of a main analogue telephone system.
- Full duplex telephone.
- Power supply via a / b line.
- 1 watt booster amplifier integrated (12 V DC power supply is required).
- Electronically adjustable volume.
- Built-in heater (12 V DC power supply is required).
- 2 potential-free contacts with various switching functions contain (eg door opener).
- Sammelruffunktion / redial.
- Programmable via telephone with tone dialing (DTMF) or buttons on the board.
- Door opener from inside via DTMF dialing.