Wide Transmission RangeBrifit hygrometer thermometer is linked to a radio transmitter which provides strong wireless signal penetration (433MHz frequency). The thermometer has a wide transmission range (30-100m/98-328ft) in the open area, the signal can be received quickly and in time in the transmission area.Multi-functionBrifit indoor and outdoor thermometer, for healthy life, measures indoor and outdoor temperature and humidity values. Mainly used to measure temperature and humidity in homes, offices, workshops, etc.Accurate reading & Large LCD ScreenLarge LCD screen for easy and clear viewing. Indoor Temperature (0-60C/32-140F) / Outdoor Temperature (-40C-60C/-40F-140F), Humidity (10%-99%) and accuracy can reach 1C/5% Automatically put data every 60 seconds (about 30 minutes to stabilize the sensor). Fahrenheit. Please note that batteries need to be re-installed after changing C/F temperature units.Portable Design & Easy Installation Indoor outdoor thermometer with wall mount and retractable bracket on the back, easy to mount on the wall or put on the table. Digital hygrometer thermometer is an ideal life partner for your family. Note: To avoid permanent damage, please note the polarity of the battery before putting in the batteries. Never immerse the product in water, which will damage the product. Change the Celsius/Fahrenheit unit first (the default setting is Celsius) before inserting the batteries. Please disassemble the batteries first to change the device when the device is working. Do not clean the product parts with benzene, thinner or other chemicals. If necessary, clean with a soft cloth. Please replace the batteries if the screen becomes dim. Specification: Indoor temperature: 0-60 / 32-140FOutdoor temperature: -40 -60 / -40F-140 FHumidity: 10%-99%Frame size: 7.5x5.8x1.9cmLCD screen dimension: 5.2x4.1cmThermo-hygrometer transmitter: 6.8x5.0x2.0cmBase station: 2 AAA alkaline batteries 1.5V (not included)Remote sensor: 2 AAA 1.5V alkaline or lithium batteries (not included, use lithium batteries in cold weather and below -20C)