The Sensaphone 1800 Monitoring System offers an easy and inexpensive way to monitor up to eight inputs under the harshest conditions. These systems notify you if they sense undesirable temperatures or other environmental or equipment conditions. You can record custom alerts and receive alarm messages in your own voice. In addition to dry contact, 2.8K, and 10K thermistor inputs; 4-20mA support allows for third-party sensor integration. Nonvolatile memory retains system settings, programming, and even logs in the event of power failure. You can call in by phone to get the status of each monitored condition.