❥Two AG10 batteries supply power for the luminous and display respectively, and the normal standby time is 2 years. (include) ❥Embedded buttons ensure the feel of the buttons while misoperation. The buttons with integrated functions are easy to use and simple to set up time. There might be slightly color difference due to different light and monitor effect. ❥High-quality ABS material, especially matching the quartz of the circuit board, the error of 0-3 seconds in 24 hours under normal temperature environment, reaching the international standard Material: abs Size: as shown There might be 2-3cm errors of dimension data due to manual measurement. ❥Green luminous, bright and not dazzling 1pc Electronic Clock ❥The mute and compact design make it suitable for examination, study, work and other occasions that need time Vibrating Alarm Clock Size chart: ❥Embedded Buttons Ensure The Feel Of The Buttons While Misoperation. The Buttons With Integrated Functions Are Easy To Use And Simple To Set Up Time. ❥The Mute And Compact Design Make It Suitable For Examination, Study, Work And Other Occasions That Need Time ❥High-quality ABS Material, Especially Matching The Quartz Of The Circuit Board, The Error Of 0-3 Seconds In 24 Hours Under Normal Temperature Environment, Reaching The International Standard There Might Be Slightly Color Difference Due To Different Light And Monitor Effect. There Might Be 2-3cm Errors Of Dimension Data Due To Manual Measurement.