Features: * Measure and display the indoor/outdoor temperature and indoor humidity * Automatically memorize the Max. /Min. Values of the indoor/ outdoor temperature and indoor humidity *Switch between C /F * Clock function and alarming function * 12/24 hour mode switch * 8 minutes snooze function * Recovery function on the Max. /Min. Values Technical parameters: * Indoor temperature measuring range: -30C+50C(-22F+122F) * Outdoor temperature measuring range: -50C+70C(-58F+158F) * Indoor humidity measuring range: 20% TO 99% (Relative humidity) * Resolution: Temperature: 0.1C; Humidity: 1% RH * Power supply: One 7# alkaline battery * Operation environment: Temperature: 0C+50C; Humidity: 5%+85% RH