The GDS3705 was built for users looking for a strong audio-only facility access and security monitoring solution that can be deployed in environments of all sizes.Grandstream GDS3705 IP Door Phone Overview

 
 
 
The GDS3705 is rated IP66 for protection against the elements and rated IK10 for protection from vandalism. It has a built-in microphone that can pick up noises/voices up to 1.5 miles away. The GDS3705 features echo cancellation so that speech comes in and out clear and communication is achieved. This unit is managed through the IP Network giving users the ability to easily check alarms, add/remove users, change setting and more.