“The monitor is powered with a 1000mAh rechargeable lithium battery and can be left running for several weeks before it needs recharging via its own internal USB/5v lithium charger.
It incorporates an internal digital temperature sensor but an external sensor can be plugged into a 3.5mm jack socket to provide remote temperature measuring. Two alarm setpoints can be set with either an audible or a visual alarm if the measured temperature goes out of the set limits.
The interval between temperature measurements can be adjusted from once every couple of seconds to once every four minutes. The longer the delay, the longer the battery will last between charges. Temperature can be measured & displayed in Fahrenheit or Celcius; changing between scales will automatically re-calculate the two setpoint temperatures.”