One problem people who own lake houses with gated entries have, is how to be notified that they have visitors when they are at their boat house or on the lake. One solution is to use a wireless intercom at the gate and a two-way handheld radio on the boat.
The intercom and radio can communicate up to a couple of miles apart. By pressing a button on the radio, the gate can be opened from a remote location.
The following products can be found on the Commercial Intercoms section of www.intercomsonline.com
The combination of products to do this is the MURS Callbox XT Outdoor Intercom with Gate Relay along with the MURS J-V110 Two-Way Radio