This is a weather clock, can clearly show the temperature and humidity, easy to read, can show the humidity and temperature trends. Features: It has memory function and can record the highest and lowest temperature and humidity. Historical temperature and humidity data can be viewed. There are two high magnetics iron in the rear shells of the main engine, which can be attached to metal objects. The back of the main engine is equipped with a bracket for standing in a horizontal position. High sensitivity, touching button control, easy to operate. With backlight, automatically turn off the backlight after 10 seconds without operation. The outdoor unit can be suspended by hanging holes or can stand on the horizontal plane. Specifications: Type: 1,2 (optional) Material: plastic Transmitter waterproof: IPX4 Indoor temperature ranges: -4 F-158 F (-20 C-70 C) Outdoor temperature ranges: -40 F-158 F (-40C-70C) Humidity ranges: 20%-95% Comfort display: dry, comfortable, moist Temperature display unit: C/F optional (default: C) Refresh rate: 10 seconds RF radio frequency: 433 MHz Power supplys: AAA battery (not included) Item size: Host: 114 * 96 * 24mm / 4.5 * 3.8 * 0.9in Transmitter: 100 * 35 * 20mm / 3.9 * 1.4 * 0.8in Item weight: Host: 142g / 5.0ounce Transmitter: 40g / 1.4ounce Package size: 155 * 135 * 33mm / 6.1 * 5.3 * 1.3in Package weight: Type1: 232g / 8.2ounce Packing List: Type1: 1 * Host 1 * Transmitter 2 * Pearl Cotton Bags 1 * English Instruction 1 * Explosion-proof Screw Set 1 * Leather Box