This is the dretec product "T-587 Learning Timer." Features: ① Large, easy-to-press "START/STOP" button ② Notifies you of the countdown time with sound and a light ③ Features a day countdown function, useful for tests and exams ④ Selectable alarm duration (15 seconds, 1 second, silent) ⑤ Key lock function to prevent accidental operation ⑥ Calendar function/Clock function (display can be switched, A or P/no display) ⑦ Convenient repeat function (can be repeated by pressing the set button while the countdown is stopped) Color: Blue (Officially blue, but the actual color is closer to light blue.) Instruction manual is not included. Please download it from the official website. I purchased it about two years ago and used it frequently, but there are no particular problems with the sound or operation. The batteries will be removed, and the unit will be shipped by itself. Instant purchase OK