This is a Dual Split watch. The watch displays minutes, seconds, and 1/100ths of a second, and has a timing range of 10 hours.
The Left and Right buttons operate interchangeably, improving user choice (time with fingers or thumbs, in either hand). AOS 4.5 watches are accurate to 1 second per 15 minutes of elapsed time.
It is water resistant to 100 ft (30 meters), and shock-resistant.