Product works well but there are two problems: 1) There was only one help booklet. I consider it bare bones. 2) There is a connector on the side of the display device, but there is no description about it. 3) The alarm volume is too low and cannot be adjusted. 4) When the button is pressed, the number will remain on the display for the set number of beeps and then for the set time. Then it disappears forever. There is no sign that the number was pressed.
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