Long lasting operates on 1x AA battery ( not included) with up to 200 days continuous use between replacements Loud alarm notification provides clear sound alerts when preset time elapses, helping manage schedules effectively Quiet countdown function ensures quiet operations during timing without distracting noises for better concentration Visual time management tool displays elapsed time with color changes to improve focus and time awareness for effective learning Simple operations allows easy time setting by rotating the timer dials, suitable for users of all ages with easy controls, Manufacturer: Oxxggkao