With the Apple Watch Series 2, you are now able to swim up to a depth of 50 meters which is great for any competitive swimmer. It also now contains a dramatically brighter display to see better in low light situations and a powerful dual-core processor giving you much faster readings.
Second Hand Apple Watch Series 2
The used Apple Watch Series 2 has functions that are supported by Wi-Fi and GPS and have a built-in accelerometer to give you an accurate reading on your speed, a gyroscope for better direction and an ambient light sensor to help you see your watch in low light situations.