Features:1.Material: High quality stainless steel metal Quiet, no tick, ensure a good sleep or work environment Night light (built-in light) is perfect at night Super loud alarm sound, suitable for heavy sleepers Measure 4 inches diameter, need 1 section AA Battery (not included)2. Does the round shape contain batteries? No, Mounting Type Freestanding Alarm Clock is Package Included: 1 x 4" Alarm Clock Note Due to different lighting and screen settings, the color of the item may be slightly different from the picture. Please allow slight size differences due to different hand measurements.3. Customer Satisfaction: If you like the product, please share your review with other customers If you are not satisfied with the item, or receive a wrong, damaged or defective item, please contact us immediately for replacement, repair or refund if any Any questions, please feel free to contact us, please reply within 24 hours, thank you4. 24-hour response time, 30-day money-back guarantee, 12-month guarantee.