Hisense H23MOBSD1H Mode D'emploi page 14

TIMER
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a. The temperature of food before cooking
would be 20-25℃. Higher or lower
temperature of the food before cooking
would require increase or decrease of
cooking time.
b. The temperature, weight and shape of
food will largely influence the cooking
effect. If any deviation has been found to
the factor noted on above menu, you can
adjust the cooking time for best result.
In standby mode, press this button to enter the
setting interface, and the countdown function
icon and "0:00" will be displayed on the display
screen. Turn the knob to set the time, the
maximum time that can be input is 60:00. After
setting the time, press the "START/+30s" button
to begins the countdown. An buzzing sound to
notify completion of the countdown