Features: 1.The clock can be set to work and rest modes, with 12/24-hour switching function. 2.The operation is simple, and the screen can clearly display the date (month, day, year) and specific time point. 3.Night mode (18:00?6:00) LED lights will automatically dim at night time, and will automatically brighten during day time. 4.The digital clock has a time memory function, no need to adjust the time for incoming calls. 5.Can be powered by USB or AAA battery, so there is no need to worry about the inconvenience caused by no electricity. specification:Item Type: LED Digital Clock Material: ABS Battery Model: 3 AAA batteries (not included) Power Supply: USB Cable / 3 x AAA Batteries Function Button: 1. Press The MODE Button To Switch The Display: Time-date-temperature-night ON/OFF 2. Press the UP button to switch between the two brightness adjustments of the lamp 3. In the time mode, press the ALARM key to display the alarm mode 4. In the alarm mode, press the ALARM button to switch the alarm function Size: Approx. 4.7 x 14cm / 1.9 x 5.5in PackageList: 1 x LED Digital Clock 1 x USB Cable 1 x User Manual