Description: Comes with 2 pieces, 1x indoor monitor and 1x wireless outdoor sensor; Humidity sensor measures indoor humidity from 20% - 99% RH Temperature sensor measures from -40 to 149 degrees Fahrenheit (-40 to 65 Celsius) outdoors, and 14 to 176 degrees Fahrenheit (-10 to 80 Celsius) indoors 4'' large display monitor, with LED backlight which can be turned off depending on different use Also works as a clock, alarm, calendar and provides with weather forecast report in 24 hours; 12/24 hours display switchable Totally wireless tabletop, wall-mountable design, let you know if your home is in a safe range Specification: Monitor size: about 14.3 x 8 x 2 cm/ 5.6 x 3.1 x 0.8 inches Sensor Size: about 9 x 6.8 x 2.5 cm/ 3.5 x 2.7 inches Frequency: 433Mhz Outdoor sensor: Outdoor transmission distance: Foresight Approximately 80 meters Outdoor temperature range: -40 to 65 (-40 to 149) Indoor Monitor: Room temperature range: -10 to 50 (14 to 176) Battery life: about 1 year Battery type (not included): 2 x AAA Batteries for monitor, 2 x AAA Batteries for outdoor sensor Package Includes: 1 Piece Indoor Monitor 1 Piece Wireless Outdoor Sensor 1 Pack Screws 1 Piece English Manual