This is a Casio watch which has a brown strap. The watch runs on batteries, so it's easy to maintain.
Casio Mens Digital Quartz Watch with Plastic Strap GBD-800UC-5ER, Beige
Watchia
Casio G-Shock Step Tracker Bluetooth GBD-800UC-5ER
GearFreak.uk
Casio - G-Shock GBD-800UC-5ER Brown