USB Powered: *Not battery operated. This non-ticking bedside alarm clock is powered by USB power cable (main powered, adapter is not excluded). This eco-friendly LED wood alarm clock is a great gift for yourself your family and the environment. Multi-Function: alarm clock displays time, temperature and humidifier with both 12/24H and /format. Three alarms setting, 3-level Auto Adjustable Brightness and Loud Speaker, USB Power Supply, Non Ticking and Sound Control. 3 buttons only, easy to set and operate. Portable size, used in bedrooms and office. User-friendly manual. Large Dimmer Display & Sound Control: Bedside clock will auto-adjust the brightness from 07:00 to18:00 (Bright) ,18:00 to 23:00 (Moderate) and 23:00 to 07:00 (Dim). With power saving mode, the display will turn off after 30 seconds, any sound over 60dB nearby will wake up the alarm clock. You can turn off this function which will make the screen always lit up. Most Easy-To-Use: Bedside clock have 3 buttons only. The most simple-to-set up alarm clock ever, meet your basic requirements. Easy operation for kids, seniors and the elderly. You can set 3 wake-up alarms. Updated version with LOUDER SPEAKER is perfect for heavy sleepers. Modern Design & Ideal Gift: Stylish and compact casing will be the breath of nature into your room, to achieve the perfect combination with simplicity. Perfect for travel desktop bedside office. Best gift for kids teens heavy sleepers.