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. Up to 3 transmitters can be connected. Transmitters waterproof: IPX4. Comfort indicator, temperature and humidity trend indicator. Degrees Celsius and Fahrenheit can be converted. Specifications: Type: 1,2 (optional) Type1: one transmitters, one explosion-proof screw set, Type 2: three transmitters, three explosion-proof screw set Material: plastic Transmitters 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: drying, comfortable, moist Temperature display unit: C/F optional (default: C) Refresh rate: 10 seconds Radio frequency: 433 MHz Power supplys: AAA battery (not included) Item size: Host: 114 * 96 * 24mm / 4.5 * 3.8 * 0.9in Transmitters: 100 * 35 * 20mm / 3.9 * 1.4 * 0.8in Item weight: Host: 142g / 5.0ounce Transmitters: 40g / 1.4ounce Package size: 155 * 135 * 33mm / 6.1 * 5.3 * 1.3in Package weight: Type1: 232g / 8.2ounce Type2: 320g / 11.3ounce Packing List: Type1: 1 * Host 1 * Transmitters 2 * Pearl Cotton Bags 1 * English Instruction 1 * Explosion-proof Screw Set 1 * Leather Box Type2: 1 * Host 3 * Transmitters 4 * Pearl Cotton Bags 1 * English Instruction 3 * Explosion-proof Screw Set 1 * Leather Box