1.There are two high magnetic magnets on the back shell of the host, which can be adsorbed on metal objects, with a bracket, and can stand in a horizontal position.The outdoor unit can be hung by hanging holes or placed on a standing table. 2.Measurement of indoor and outdoor temperature and humidity, Celsius and Fahrenheit conversion.The highest and lowest temperature humidity memory function can view the historical temperature and humidity data. 3.Up to 3 outdoor units can be connected.High sensitivity touch key control, easy to operate. 4.Time, alarm clock, snooze function.Temperature and humidity trend indication. 5.Outdoor unit XP4 waterproof (to keep the outdoor unit in good use, the outdoor unit should be placed vertically to avoid direct sunlight and direct long-term rain.) Power supply : Host Need 3 x AAA batteries (not included), Transmitter Need 2 x AA batteries (not included) Color: Black White Material: plastic Package Contents: 1 x host 1 x transmitter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.