Sapphire crystal with double-sided anti-reflective coating Titanium carbide treatment Wristband size range: 150–195 mm Other: Neobrite Case dimensions (H × W × D) 47 × 42.6 × 11.1 mm Weight: 88 g Case and bezel material: Titanium Metal band (titanium) Solid band One-push triple-fold clasp with slide adjustment mechanism Water-resistant to 10 bar Time adjustment Radio-controlled watch: Compatible with Japan, North America, Europe, and China regions (MULTIBAND6) Bluetooth: Connects to a smartphone to automatically adjust the time Power Source & Battery Life Tough Solar (solar charging system) Mobile Link Function Mobile Link Function (function synchronization via Bluetooth communication with compatible mobile phones) App Compatible with "casio watches" App Link Function Automatic Time Correction Easy Watch Setup World Time (approx. 300 cities) Time & Place Watch Status Display Self-Check Mobile Phone Finder Premium Production Line Certificate of Authenticity.