100m Long Distance Transmission: Indoor Thermometer With the handheld transmitter to sensor outdoor temperature and transmit within 100m unobstructed. 12/24H/ Switchable : Wireless indoor outdoor thermometer, 12H/24H format, temperature unit /unit for selection. Can be placed on the table or hung on the wall. Wireless Technology: Indoor and outdoor thermometer adopt wireless technology, you can know the outdoor temperature in the indoor receiver. < p>Comparison of Indoor and Outdoor TemperaturesRecord the maximum indoor and maximum outdoor temperature.Display the indoor/outdoor temperature and time at the same time. Back Bracket Design: Indoor Thermometer outdoor connected Can be placed on the table or hung on the wall. Function: Clock function, indoor temperature, outdoor temperature, memory of minimum/maximum temperature values. Size: main unit: 150 x 86 x 20, sub unit: 130 x 40 x 21 Temperature function: Indoor temperature detection range: 0 C to 50C (32F to 122F) Outdoor temperature detection range: -30C70C (-4F158F) Detection cycle of indoor temperature: half a minute Outdoor temperature detection timing cycle: 1 minute Resolution: 1/1 Setting mode time: In standard mode, long press "SET//" key to enter time setting mode Set item will flash at 1HZ frequency The setting sequence is: 12/24 hour minute offset output Set the result, press "SET" key //" to confirm Press the "+/MAX/MIN" key once, the set value will increase by one step, long press this key for more than 2 seconds, the set value will advance at a speed of 8 steps per second When the button is not pressed within 30 seconds, it will automatically exit setting mode and the set value will be saved < p>Commodity list: 1 master unit, 1 slave unit (note: battery is not included).