GSM Remote Relay Switch Access Controller T201 GSM Temperature Alarm 2G/3G/4G

--\n--\n--\n--\n--\n--\n--\n--\n--\n--\n--\n--\n--\n--\n\nFeature: \n 1. * It can be operated anywhere, and no distance limit.\n2. * Up to 200 authorized phone numbers. The 1st ~3rd user numbers can receive SMS, and the 4th ~6th user numbers can receive calls when alarm occurs. 1~200 authorized phone numbers can call T201 to turn on/off the Relay0.\n3. * External AC/DC power status monitoring, AC/DC power on/off will send SMS and immediately call 6 preset mobile phones.\n4. * Timer report can be set every few hours, and its status/value will be automatically sent to 6 preset mobile phones immediately.\n5. * Support remote reading of historical data via SMS.\n6. * Automation system, when the temperature, power supply alarm or normal, it can link to Realy1 for operation.\n7. * Alarm output, when alarm occurs, it will output for 30 seconds.\n8. * Internal rechargeable battery can be used continuously for 6 hours.\n9. * Safe, use caller ID and password for identification, unknown callers-