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.