Power-on self-test: All segments are displayed on the LCD screen, and the buzzer sounds for 2s at the same time. After the self-test is over, the age selection interface, AGE?, is displayed, and the display age value is set (can be selected between 13-80). After the age selection is completed, press the ENTER key to enter the waiting interface. In this interface, INTERVAL, READY, (WORK), (REST), (TARGET), (TIME), (DISTANCE), (CALORIES), (TIME) , (DISTANCE), (CALORIES), (WATTS), (SPEED), (RPM), (HEART RATE) are displayed alternately and cyclically, and the alternating interval is about 1s, waiting for the next step. While waiting for the interface, press the START button to start the free training mode. In this mode, the current total running time, distance, calories, power, speed, rotation speed and heart rate are recorded. LCD display: When displaying the total, it displays the timing, displays the distance, displays the calories consumed, displays the power, displays the speed value, and displays the rotational speed value. When the STOP key is pressed, TOTAL, AVE and MAX are displayed alternately, and the corresponding value indicates its average value. Displays the heart rate reference value corresponding to the power-on set age, and displays the heart rate detected during the exercise cycle. The actual shipment does not include batteries,Without heart rate function. Batteries: 2 x AA batteries or 4 x AA batteries (more batteries will last longer) Colour: black Material: plastic Package Contents: 1 * Rowing Machine Counter 1 * Induction line Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: The product may have a slight tolerance of 1-3 mm/1-3 g in size/weight, and the image color may differ from the actual item due to lighting.