DC power supply: backlight is 4 levels Battery powered: lights up for 15 seconds Power supply: 2 x "AA" Battery: DC 4.5 V 150 MA 【MULTIPLE FUNCTIONS】Indoor/outdoor temperature, humidity, weather forecast, atmospheric pressure, moon phase, environmental comfort display, current time calendar, clock with snooze function, dynamic forecast symbols and adjustable backlight brightness. Auto-setting the correct time of the standard time zone. You can also adjust it manually if you wish. These functions will allow you to plan your day even better.< /p> 【ADJUSTABLE BACKLIGHT & PORTABLE SIZE】 Its portable size of 185*107*30mm allows you to place it anywhere and does not take up too much space. It is the best replacement for alarm clocks. When you turn it on, you can adjust the backlight brightness according to day/night. You see everything at a glance. 【INDOOR OUTDOOR HYGROMETER THEMOMETER】 You can also set customizable alerts for temperature and humidity and quickly view the daily minimum and maximum settings on the console. Weather forecast shows upcoming hours with weather variations. Helps you be prepared for real-time conditions when you want to venture outdoors. 【LONG AND STABLE DATA TRANSMISSION】 Monitored data can be transmitted up to 60m from the outdoor sensor (at outside without obstacles) to the main unit. It allows you to monitor your house in all rooms or courtyards. Its practical design makes it easy to hang on the wall or place on a desk. (Please note: The package only contains one outdoor sensor). There are seven languages to choose from. Size: 185*107*30mm < p>Delivery quantity: One piece