The attached picture contain detailed instructions.No radiation, big bell, walking quietlyand accurately, easy to operate, decoration strong visual as well Adopt the scanning second core to run uniform speed. Mute + have two chord music exchange to bell+ Night light and can be adjust to lazy sleep mode Size: Height 13 CM/5.12 inch, Width 13CM/5.12 inch,Thickness 11CM/4.33 inch. Material: New ABS plastic, environmental and safety 2 x AA batteries charged, Need to equipped with battery by yourself. Be perfect for be for sleepy kids and office workers Everyone should have their own little alarm clock, be suitable for sleepy students and office workers. It can also be a practical gift to your favorite family and friends. A small alarm clock is a wonderful gift