0.9 " x 0.9 " Custom Two-Window Design Display/ Solar Charging/ Fiber-Reinforced Polymer Case/ Military Standard 810/ Body Battery Energy Monitor/ Wrist-Based Heart Rate/ Pulse Ox Sensor/ Multi-GNSS Support/ ABC Sensors/ TracBack Routing/ Smart Notifications/ Pair For Satellite Communication/ 16MB Memory/ 10 ATM Water Rating/ Bluetooth, ANT+ Connectivity/ Tide Data/ Surf Activity/ Silicone Strap/ Black, Grey And Blue Finish