Cordless Phones

[Commercial]

Hi there,
This is a very specific question, but I might get some help.
I need 2-3 cordless phones for a shop which has an outdoor area that needs a 300 metre range. The port will be in the shop and the range will be for outdoors.
I need durable phones as they will be outside.

Any help would be greatly appreciated

 

[Leo]

The BT Diverse Elements phones sound ideal here. Weatherproof and up to 1km range. BT just re-badge other manufacturer's tech, so I'm sure other brands do similar models.