CASIO PRJ-B001B-2JF PRJ-B001B-2DR PRO TREK Hiker Line Solar Tough Bluetooth
CASIO PRJ-B001B-2JF. This is PRO TREK's lightest model, matching those who enjoy long trails and ultralight hikes. (as of April 2024). The combination of a cross band and bungee cord improves ventilation and fit to the arm.