Proof that a dive watch can be fun & functional with the Citizen® ISO-compliant Promaster Professional Diver. With Eco-Drive technology, it is powered by light and never needs a battery, so you'll never need to open your caseback making sure your watch maintains it factory sealed and water resistant. Featuring our Eco-Drive technology – powered by light, any light. Never needs a battery. Caliber number E168. Product Details MODEL BN0150-28E 8/10/2017 MOVEMENT TECHNOLOGY E168 Eco-Drive Powered by any light source, continuously and sustainably, eliminating the need to replace watch batteries. BAND LENGTH (MM) 216 CASE WIDTH (MM) 44 LUG WIDTH (MM) 20 BAND TYPE Strap Polyurethane CASE MATERIAL Silver-Tone Stainless Steel Promaster Crown One-Way Rotating Elapsed Time Bezel CRYSTAL Anti-Reflective Mineral Crystal Impact and shatter resistant - anti-reflective coating deflects light CLASP Buckle DIAL Black Luminous Hands and Markers WATER-RESISTANCE 200M/20Bar [Scuba Diving] ADDITIONAL FUNCTIONS 3 Hand Date