Further information for Gira 1258 00 - built speaker 00 1258 door communication system
			
			Inwallspeaker door communication system built-in loudspeaker for installation in letterbox systems, Sprechfaecher, Tuerseiteneinbauten or front panels.  To the existing screw can up to 8 mechanical push buttons are connected.  The built-in loudspeaker offers the following product features: - Signaluebertragung and supply of the speaker about the reverse polarity protected and short-circuit-proof 2-wire bus.  - Small size.  - Weather-proof speakers.  - High-quality electret microphone.  - AC query the doorbell connections to prevent oxidation of the key contacts.  - Protection against incorrect connection of the terminals.  - Up to 8 mechanical push buttons connected.  - Color camera for Tuerstation connected.  - Speakerphone (voice-controlled talk-back with echo and background Geraeuschunterdrueckung).  - Sprachlautstaerke adjustable.  - A one-man operation with easy startup procedure.  - Acoustic acknowledgment signal at Ruftastenbetaetigung.  - The component of the structure of Tuerkommunikationsanlagen is possible with up to 7 participants (eg 
  Ceiling Speaker, 5 expansion modules for built-in speaker, 68 home stations AP).  Power supply: 26 V DC 2 V (bus) connections: 2 screw terminals for 2-wire bus connections: 2 screw terminals for additional supply connections: 8 screw for mech.  Rings connections: 
  Screw joint mass of the Rings connections: 2 system bus connector strips connections: 
  Video connector Dimensions: W x H x D 
  x 67 x 27 mm Temperature range: -25 C to +7 C Protection: IP 44 Type: 
  258 sales unit: 
  ST.