This is the compact and wearable GMA-B800, which comes with a pedometer and a Countdown Timer feature for interval measurement. It includes plenty of features that prove handy in everyday health management and workout sessions, and the genderless design has been made so compact that it fits even the most slender of arms. Function-wise, the three-axis Accelerometer measures how many steps are taken each day and keeps track of steps and walking pace. Bluetooth® communication connects the watch to your smartphone, allowing you to use the dedicated G-Shock Connected app to check your daily steps and the number of calories that you've burned. It also supports everyday health management by displaying exercise intensity split across five levels on a graph. Shock resistant 20 bar water resistant Lets you know the number of steps Easy to operate via smartphone Easy to see in darkness Great for various sports