Wall clock 30cm - Silent - Plastic - "Maths"nXt's Maths (30cm) silent wall clock makes your time checking both interesting and challenging. You train your mind every time before you know the time. It is perfect for solution seekers who are looking for something fun and special on the wall. This clock runs on 1 x AA battery (not included) Product specifications: Material: Plastic Clock type: Wall clock Color: Black Size: 30cm Battery type: 1x AA battery, not included Movement: No ticking sound.