Tachymeter The tachymeter allows you to calculate average speed using the scale engraved on the bezel and the chronograph hand. To calculate the average speed of a car, start the chronograph at the beginning and stop it when you've traveled 1 km. The tachymeter scale indicated by the chronograph hand at that time will be the average speed. Red Second Measure the time it takes to run 1 km (within 1 minute) Read the number on the tachymeter indicated by the center stopwatch hand (seconds) Example: If it takes 45 seconds to run 1 km... 80 km/h 【High Water Resistance】 This SPALDING wristwatch is clearly marked "WATER RESISTANT" and is well protected from water exposure in daily life. You can use it with confidence in the pool or on rainy days. 【Stylish Design】 The black dial and stainless steel case combine to give a simple yet sophisticated impression. It can be widely used from business scenes to casual situations. 【Multi-function Chronograph】 This watch is equipped with a chronograph function, allowing measurement in seconds. It is convenient for timing sports or everyday activities. - Brand: SPALDING - Water Resistance: WATER RESISTANT - Color: Black - Material: Stainless Steel - Function: Chronograph - Display Type: Analog Width 3.8cm Boys Bracelet wrist circumference 17.5cm Working Thank you for viewing. Belt Color... Silver Dial Color... Black Operation... Good Scratches/Cracks... None