Dretec Digital Thermometer/Hygrometer, Wireless, Waterproof, Wall-Mounted Stand, Hanging, Handset Only, Includes 2 AA Batteries

This product is sold with only one handset. One handset is included with the purchase of the main unit, allowing for a total of three connections, so we recommend purchasing two. The handset is IPX4 waterproof and can withstand slight wetness. You can also check outdoor temperature and humidity by placing the handset in your entryway or on your balcony. Measurement results can be transmitted from the handset to the main unit up to approximately 30 meters in clear visibility. Measurement values are transmitted to the main unit approximately every 110 to 160 seconds. The LED lamp on the surface (inside) of the handset flashes while transmitting data. The heatstroke/influenza warning indicator lets you see the risk level at a glance and take immediate action. Useful for preventing heatstroke in the summer, heat shock in the winter, managing the health of family, pets, and plants, preventing influenza and colds, checking the dryness of your room, preventing mold in your closet, and guiding your clothing during seasonal changes. It's also recommended for outdoor activities and car camping. *Do not install the handset in the following locations: In direct sunlight. Locations subject to the effects of airflow from air conditioners, air conditioner outdoor units, heaters, humidifier ventilation fans, etc. Locations subject to direct rain or snow splashes. Locations subject to water droplets due to condensation.