Check the listing for details. Aiphone GF-1DK Audio doorphone for Aiphone BUS systems GF. Condition: New. Listed at 250.00 USD. Aiphone GF-1DK doorphone. Replace Aiphone GF-1D: GF-1DK is new model of the phone with some technical fix. Aiphone bus systems: Present bus system is "GT", and Aiphone sell it globally. Earlier step of Bus systems was named "GF", and mainly only spare part is phone GF-1D(K). No video monitor (GF-1MD). So, if you need GF-monitor, replace it with normal audio door phone GF-1DK. Mainly, "if you can fix it by phone replace, ok. If not, replace all the system." Older systems, eg. GM- nothing. Now GT, earlier GF, ancient GM. GF-1D: Order this GF-1DK.GF-1D: Order this GF-1DK.GF-1MD: Monitor not available, order this GF-1DK.GM, etc: not available yet, replace all the system. Check also our other items, eg. compatible outdoor unit for VC-serie. Additional recommendation: Before order check your contact information is complete contain phone number and any email you can read, eg. ebay-email. Reason: We send all products from Finland globally. Without problems. But Ebay transport/cargo systems are not avalaible here. We use EMS, Economy, sometimes UPS. Without phone number delivery is unreliable and receiver must follow packet. Phone number we really not need for our own use. So: before order check your contact information are ok.