Healthy life starts from this moment! Feature: 【3 Wireless Transmit Sensors】 The 3 remote sensors can be put in three different places whatever indoor or outdoor. The thermometer can display the indoor temperature and 3 sets of outdoor temperature and humidity simultaneously. Besides, The rate of changing icon detects rapid changes in temperature and humidity. 【Humidity Expression】 Large LCD display with simple and clear readings. Indoor temperature (0 - 60℃); Outdoor temperature (-40 - 60℃); Humidity (10% - 99%). The temperature and humidity accuracy: ± 1℃ / ± 5%; Wet: humidity﹥65%; COM: 45%≤humidity≤65%; DRY: humidity﹤45%. The express changes following the changing of the humidity. 【Backlight & Battery Life】 You can press the "Light" button to turn on the backlight. It will automatically turn off after 5 second if without any operation. This help you to read the data clearly even though at night. Minimum 12 months for base station with one sensor. 【Max & Min Record】 Max & Min functions on indoor and outdoor on both temperature and humidity. The data update every 60 seconds. Press the ℃/°F button to switch between celsius and fahrenheit. Perfect on your house, office, factory, etc. Time & Alarm Clock, Calendar, Snooze / Light. 【Easy to Operate】 The Station and transmitter signal distance: 100M/328ft. It can be stand in the desk or hang on the wall as you like. The station need 3* AAA Battery(not included); Sensor need 2*AAA Battery.(not included). When the sensor shows the low battery icon, that means you need to change the new battery in the sensor. Specification: Base Station: -3 x AAA Batteries (not included); -Dimension: 9.5 cm * 7.8 cm * 2 cm (L * W * H) Remote sensor: -2 x AAA Batteries (not included) -Dimension: 5.3 cm * 7.4 cm * 2 cm (L * W * H) -Frequency: 433 MHz -Refresh rate: 60 s -Transmission range: 100M / 328ft (open area) -Comfort level indicator: - dry (RH <45%) - Comfortable (RH 45% ~ 65%) - Wet (RH> 65%) - Indoor temperature range: 0 ° C ~ 60 ° C (0 ° F ~ 140 ° F) - Indoor humidity: 10% -99% - Outside temperature range: -40 ° C ~ 60 ° C (-40 ° F ~ 140 ° F) - Humidity outdoors: 10% -99% - Accuracy: ± 1 ° C; ± 5% (only between 20 and 90% guaranteed) - Resolution: 0.1 ° C; 1% Package included : 1 * Indoor Outdoor Thermometer Hygrometer(Battery Not Included) 3 * sensor(Battery Not Included) 1 * user manual NOTE: ▲ If the sensor communication is interrupted, press the CHANNEL button for 3 seconds to get the signal again, or replace the batteries with new ones. ▲ Due to the shipping of reason,the battery not included. Manufacturer Information: Company: BLACKSTONE ELECTRONICS CO LIMITED Address: UNIT D12 ON 16TH FLOOR JING HO INDUSTRIAL BLDG NOS.78-84 WANG LUNG ST TSUEN WAN NT Email: black_stoner@outlook.com Tel: +8618123753837