Ritron Inc.
Q-Series Analog Callbox
The Q-series analog callbox is a fixed-location wireless 2-way callbox that allows direct wireless communication to be positioned exactly where it is needed to maximize safety, security and manpower efficiency. The Q-series deploys easily, with no trenching or extensive construction required. This compact, cost-effective wireless callbox allows staff and visitors to communicate with existing portable radios and base station radios, thus more fully utilizing existing communication assets.
http://www.ritron.com/callboxes.html