Guardian’s Indoor Industrial Telephones are used within environment calling for rugged and dependable equipment but don’t require certification. A number of these phones were originally designed for a specific purpose and have since been used for an extensive list of additional applications. Our SCT family was originally designed to meet the needs of potash mines. The VRT & VRR telephones are specifically designed to withstand vandalism. The DTT-20 Desktop with its Kydex 100® faceplate model is a standard within industrial office locations. Whatever your environment, we have a phone that will meet your distinct environmental requirements.