【Wide Temperature Range】Indoor temperature range: -9.9℃ to 60℃ (14.18℉ to 140℉). Outdoor temperature range: -40℃ to 60℃ (-40℉ to 140℉), providing comprehensive temperature monitoring 【Humidity Monitoring】The device also displays outdoor humidity levels, ranging from 10% to 99% RH, ensuring complete climate monitoring for your environment 【Selectable Temperature Units】You can easily switch between Celsius and Fahrenheit temperature units to suit your preference or location 【Wireless Transmission & Easy Setup】With a wireless transmission range of up to 100 meters in open space, the receiver offers flexible placement options 【Convenient Placement】The receiver features a stand for tabletop use or a wall-mounting hole for easy wall installation, while the transmitter also has a wall-mounting hole for convenience 【Practical Features】Records the maximum and minimum temperatures of the past 24 hours, giving you a detailed temperature history. The device also includes a low battery warning for added convenience Specifications: Screen size: 2.56 inches Material: ABS Power supply: 2*AAA batteries for receiver and transmitter (batteries not included)