This is a useful smart watch from Casio. Black is the only available colour for the strap.
From ELLA Juwelen
Casio Uhren - GBD-100SM-4A1ER - rot
Watchia
Casio G-Shock GBD-100SM-4A1ER
Watch Shop
Casio G-Shock G-Squad Bluetooth Steptracker Smatchwatch - Black / Black