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GSM intercom systems use mobile phone technology to communicate through existing mobile telephone networks. All you need is a SIM card (not provided). Benefits include..

• No range limits at all.

• Rings multiple numbers when the call button is pressed, so if you are not at home, you can receive a call on your mobile and grant access to your visitor.

• Access control built in by telephone number recognition. Program in your friends and family numbers so that they can simply "ring your gate" to gain access".

• No need for handsets inside your house, no cabling, no damage to decor!