Visol UltraModern Circular Digital Hygrometer Brushed Aluminum Finish with Screw Accents; Digital Hygrometer with Precise Readout; Color Coded Humidity Marker (Green showing Ideal Humidity); Battery Included (G13A Micro Cell 1.5 V Alkaline Button Cell); Three Black Button on the Back for Calibration (C = Reset, + = Max/Min, - = C and F) 2.9 inches (Length) x 2.25 inches (Width) x 0.6 inches (Thickness); Approx. Weight: 0.23 pounds; Shows Digital Temperature; Can be Easily Attached to Any Cigar Humidor; Made with Plastic; Battery can be Easily Changed; Large Circular Frame for Easy Reading Comes Packaged in Cardboard Box