The non audible Medium Time Timer operates free-standing or wall-mounted.
Suitable for personal use and group sessions. Customize yours with pictograms or a blank face and stickers (see the third video below).
Operates on one AA alkaline battery (not included).
Dimensions: 18 × 18 cm.

Videos about Time Timers:
How Time Timer works
At Work with Time Timer
How to use Time Timer Blanks (Be creative!)