Citizen Men's Eco-Drive Chronograph Two-Tone Stainless Steel Bracelet Black Dial Analog Watch - BL5406-56L. World time in 40 time zones, perpetual calendar, anti-reflective sapphire crystal, and day and date make it the perfect watch for someone on the move. Featuring our Eco-Drive technology - powered by light, any light. It never needs a battery. Caliber number E820. This watch is perfect for those unwilling to compromise when it comes to the marriage of quality, features, and high-end fashion sensibility.