Introduce：Features: * indoor & outdoor temperature display, indoor humidity display * temperature unit ℃/℉ changeable * memory of MAX/MIN value of indoor & outdoor temperature *comfort level display Temperature Range: indoor temperature: -10℃～+50℃ (+14℉～+122℉) outdoor temperature:-50℃～+90℃ (-58℉～+194℉) Humidity Range: indoor 20% RH～90% RH Product Dimension: 98× 58×13 mm Power-supply: 1.5V (AAA) x1