This easy to use visual timer runs on AAA batteries (not included). It is portable, easy to use and quiet with no loud ticking. They also have three different options for when the timer goes off. Low, loud or mute with flashing light.
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Sizes;
Regular: 8.8*8.8cm
Large: 16*16cm
The large ones have a hole (for hanging), a stand and a large magnet on the back.
Avoid turning the knob past the 0 counterclockwise at it can damage the timer.