Specification Model T201Voltage Input DC 9V 24V 1ANetwork 2G 4G Optional Temperature Range 55°C 125°C Accuracy 0 1°CStorage Temperature 20°C 60°C Humidity 10 90 Output Relay Voltage 3A 240VACDimensions 96 5mm 72mm 59mmWeight 188gFeatures 1 Supports up to 200 authorized phone numbers for operation via GSM Network 2 Sends SMS alerts and status updates for temperature or power failures immediately 3 Capable of temperature and power status monitoring with external AC DC input 4 Equipped with a timer for periodic reporting and remote value storage 5 Includes a siren output system for alarms lasting up to 30 seconds 6 Built In Rechargeable Backup Battery provides up to 6 hours of operation during power outages Package Includes 1 x T201 GSM Remote Control