Citizen Men's BZ0016-50E The Signature Collection Eco-Drive Grand Complication Watch Eco-drive is fueled by light, any light, so it never needs a battery. 1/4 second chronograph Perpetual calendar Dual-coated anti-reflective sapphire glass crystal. Minute repeater Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving