SEIKO SBXB087 Men's 8X Series World Time Watch with Solar Power, Dual Time Zone, and Sapphire Crystal for Ultimate Precision and StyleProduct Overview Achieving the world's thinnest GPS solar watch with a thickness of just 12. 4 mm. Seiko has developed its own GPS module, which is considered the heart of GPS solar watches, maintaining the highest reception performance while simultaneously achieving a slim design through optimal structural engineering. Detailed Specifications Gender Men's Dial Multi hand Analog Movement Type Solar Case Shape Round Case Material Pure Titanium Glass