Temperature GSM Humidity Alarm Power System Blue/Black/Grey 6.69x3.54x3.35inch

Overview: The GSM SMS Environment Alarm is special for remotely monitoring onsite temperature, humidity, power status through wireless GSM Network, no distance limit, which also supports Android APP control, very convenient. Features: *Threshold exceeding alarm. When the temperature, humidity, power voltage exceed high threshold or low threshold value, will send SMS alert to up to 10 preset mobile phone immediately. *Up to 10 authorized phone numbers, 5 can be used to receive call or SMS, and 5 can be used to call and SMS while alarm occurrence; *No call charges for inquiry. The GSM Environment Alarm rejects the call from authorized number then return onsite temperature, humidity, and power voltage on the first 'ring'; *External AC Power status monitoring, AC On/OFF will send SMS to authorized phone numbers; *Programmable by SMS Commands or Android APPs with password protection; *Secure - Using caller ID and password for identification, unknown callers are ignored; *Inbuilt MCU monitoring the DC input Voltage value, measure range is 9-24VDC, no need additional sensor to save cost; *Timer Report—Can setup every x hours automatically send its status/value to the authorized numbers; *Rechargeable backup battery inside can last 8 hours; *Built-in buzzer led for environment alert; *GSM Frequency: 850/900/1800/1900MHz; *DC Power Supply: 9