Time,alarm clock function,8 minutes sleep function; It can measure indoor temperature & humidity,outdoor temperature MAX & MIN temperature and Humidity memory function ℃ and ℉ temperature switch function It with (-1~+4)℃ frost alarming Working voltage: 5V, lowpower supply Temperature measuring range(indoor) : (-10～+50)℃ or (+14～+122)℉ Temperature measuring range(outdoor) : (-50～+70)℃ or (-58～+158)℉ Temperature resolution : 0.1℃ or 0.1℉ Temperature accuracy : ±1℃ or 1.8℉ Humidity measuring range:(20%～99%)RH Humidity resolution:1%RH Humidity accuracy: ±5%RH (≤80%RH) ± 8%RH (> 80%RH)