Casio Unisex Extra Long Strap W737HX-1AV Casio Data Bank while the GST-B400-1A keeps it

while the GST-B400-1A keeps it classic with its minimalist black-on-black design

BAND ONLY  - Black Red

the automatic calendar always displays the correct date

comes a smart power series

Other standard features include a step tracker (pedometer)

Casio Unisex Extra Long Strap W737HX-1AV Casio Data Bank while the GST-B400-1A keeps itA watch with style and functionality, plus an extra long band for a more comfortable fit. The front button makes it simple to access the LED backlight so you can easily read the dial in dark places. These watches also come with handy everyday features like stopwatch, alarm, timer, calendar, and dual time functions, not to mention water resistance up to 100 meters and a 10 year battery you wont have to worry about for ages.