Features: Silent Movement: Give you a quiet night, maximum reducing power consumption and effectively extending the life of the movement. Easy to Inatall: Package includes self-adhesive stickers and auxiliary scale ruler for easier installation.Each mirrors have a protective film, please tear off after installation. Battery: AA 1.5V battery(not included). NOTE: Please do not use too much power battery, or the movement will be broken. Enjoy the Fun of DIY: Design the position and size of the clock as you like,at the same time,you will enjoy the fun of DIY with your family and friends. The perfect wall clock for an office, classroom and any room in your home, large Acrylic numerals also it can be seen from the adjacent room easily.