You can place the weather instrument on the wall of a room or nursery to keep an eye on the temperature and humidity data in the room. The thermometer-hygrometer with clock is also equipped with a temperature sensor, the wire of which can be located outside the room, for example through a window. This allows you to measure and transmit data about the outside air temperature. In addition to weather data, the device can also be used as a normal electronic clock; its display shows the time continuously. With an alarm function, the weather meter is able to remember the minimum and maximum temperature values for the entire operating period. Power Supply:1 x AAA batteries(Not included batteries) Colour:As Shown Material:Plastic + Electronics Package Contents: 4 * Electronic Thermometer and Hygrometer 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.