Tera Indoor and Outdoor Digital Thermometer Hygrometer Temperature and Humidity Monitor Gauge with Detector and MIN/MAX Records White Large display, easy-to-read tells indoor & outdoor temperature, and indoor humidity Temperature unit Degree / changeable Memorize MAX and Min values of indoor/outdoor temperature Charging by 1 AAA battery (not included), battery easy to get Suitable for testing the temperature indoor and outdoor, and testing the humidity indoor