【Accurate Readings】Wireless indoor and outdoor thermometers provide accurate indoor and outdoor temperature and humidity readings. Accuracy: ±1.1°C and ±2~3 % relative humidity 【Cold-Resistant & Waterproof】The weather thermometer with fully sealed sensor contains a rechargeable lithium battery to monitor humidity and temperature down to -35℃, ensuring rain or shine transmission. 【Range up to 60m】The remote thermometer can measure temperature and humidity percentage up to 60m/200ft. Track environmental conditions at up to four locations with 2 additional remote sensors (requires purchase of 2 additional sensors) 【 Content-Rich 】 The backlit touchscreen displays current indoor and outdoor temperature and humidity, including trend arrows and max and min records to help you stay on top of changing conditions.