Features:_x000D_1.The high-definition mirror refracts a little bit of light and shadow, and it is matched with a silver rotating shell to transmit the visual rhythm, frequency and rhythm of the visual without elements, cool fashion, agile and restrained_x000D_2.Precise electronic timer, avoid repeated mechanical pressing every 5 seconds, fast adjustment_x000D_3.Large mirror high-definition digital display, standing or sitting, the numbers can be seen clearly at a glance_x000D_4.Mute digital display timing design, silent when walking, learning more calmly, and office more focused_x000D_5.Three levels of timing reminders, adaptive to different environments, demand for sound size_x000D_6.00:00-99:55 adjustable range, support broadcast positive and negatives dual timing, simpler time measurement_x000D_7.Easily adsorbed on blackboards, refrigerators and other metal surfaces are firm and not afraid of falling off_x000D_Notice:_x000D_Actual color may be slightly different from the image due to different monitor and light effect_x000D_Please allow 1-3cm deviation due to manual measurement1.Name: rotating countdown timer_x000D_2.Material: ABS_x000D_3.Colour: Black_x000D_4.Working voltage: 4.5V 3 AAA batteries, this product does not contain batteries_x000D_5.Working temperature: 0c-50CC Timing range: 99 minutes 55 seconds_x000D_6.Volume file: silent 0db/low volume file 60-70db high volume file 80-90db_x000D_7.Product size: 7878*27.5mm_x000D_8.Countdown setting:_x000D_1.Turn the knob to set the required countdown time, press the mirror to start the countdown_x000D_Rotating to the right increases the value, and rotates to the left to decrease the value. If the angle is greater than 60 degrees, the rapid rotation is the set minutes, and the average speed is less than 60 degrees the set seconds_x000D_Positive timing settings:_x000D_1.After setting 00:00, press the mirror to start timing long press for 1 seconds when the timer is pausedPackage List:_x000D_1*Stopwatch