Features: Smart window open/close instructions will help you better controll the air quality at home Three touch buttons on screen for easy setting Vivid house and tree printing ensures a clear visual division Get accurate humidity & temperature readings just by a simple glance Up to 3 remote sensors can be paired to the main unit Transmitting distance is up to 260 feet 3 comfort level indicators for indoor humidity Time display in 12/24 hour selectable White backlight can be activated for 20s by pressing top button Specification: Item size: Main Unit: 137x21x86mm(5.4'x0.8'x3.4'in) Sensor: 60 x 27 x 96mm(2.36' x 1.06' x 3.78'in) Box size:106x35x210mm(4.17'x1.38x8.27'in) Net weight:260g Package weight:280g Color:Black & Silver Main Unit Powered by 3 x batteries (Not Included) Remote Sensor Powered by 2 x AAA batteries (Not Included)