【100 m remote transmission】: Indoor thermometer. With the handheld transmitter, you can measure the outside temperature from the sensor and transmit it within a radius of 100 m without obstacles. 【12/24 hours, ℃ / ℉ switchable】: Wireless indoor/outdoor thermometer, 12-hour/24-hour format, ℃/temperature unit for selection. Can be placed on the table or hung on the wall. 【Wireless technology】: The indoor and outdoor thermometers use wireless technology, you can determine the outside temperature in the indoor receiver. < p>【Indoor and Outdoor Temperature Comparison】: Records the maximum indoor and outdoor temperature and displays the indoor/outdoor temperature at the same time. [Rear Bracket Design]: Externally connected indoor thermometer. Can be placed on the table or hung on the wall. Function: Clock function, indoor temperature, outdoor temperature, storage of minimum/maximum temperature values. Size: Main unit: 150 x 86 x 20, Sub-unit: 130 x 40 x 21 Temperature function: Indoor