Specifications: Material: Acrylic Thickness: 2 mm Processing: Laser Installation: DIY (template included) S size:13*21 cm (Finished size: 25*35cm) Power: 1 x AA 1.5V battery (not included) Key features: High brightness, easy to clean and bright Metal pointers, accurate and durable Made from high quality Acrylic, non-toxic and environment-friendly Self-adhesive, easy to install and remove, be applied on smooth surface, such as walls, doors, windows etc. Silent, non-tickling quartz clock operation •CE, RoHs certified Package includes: Number digits or wall stickers pattern Clock mechanism Clock hand installation: Step 1. Insert hour hand Step 2. Insert minute hand Step 3. Insert second hand Reminders: Hands must be parallel Must be installed by an adult or with adult supervision There is sticker on surface to protect the clock, don't forget to remove the sticker