Mute Luminous Mini Portable Digital Electronic Clock Student Exam Study Pocket Watch Description: Two AG10 batteries supply power for the luminous and display respectively, and the normal standby time is 2 years. (include) 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 Green luminous, bright and not dazzling Embedded buttons ensure the feel of the buttons while preventing misoperation. The buttons with integrated functions are easy to use and simple to set up time. The perfect mute and compact design make it suitable for examination, study, work and other occasions that need time Specification: Material: abs Size: as shown Note: There might be 2-3cm errors of dimension data due to pure manual measurement. There might be slightly color difference due to different light and monitor effect. Package includes: 1pc Electronic Clock Miayilima Mute Luminous Mini Portable Digital Electronic Clock Student Exam Study Pocket Watch Ready to disassemble and use, easy to clean. High quality materials, use with confidence. A portable tableware tool that is perfect for family gatherings, outdoor barbecues, event parties, school graduation, and other occasions. Having it will not take up space, but it can also bring a lot of convenience to life and bring more fun.