Men's Volta PU Solar Black Rubber and Dial Gunmetal IP Steel Case The Volta PU collection by Nixon is rugged, solid, and stylish. Its comfortable, patented locking looper black rubber strap, calm black dial, big case, 100M capability and solar movement make this piece a great addition to any man's collection. Complete yours today. Case shape: Square Calendar: Date Movement: Solar Clasp type: Buckle Warranty information available at ILS Watch Warranty Co.. Watch box included.