Pulsar Men&#39;s PS2004 21 Jewel Mechanical Self-Winding Battery-Free Automatic Two-Tone Bracelet Two-Tone Case Silver-Tone Dial Watch 21-jewel mechanical automatic Self-winding battery-free power On-dial aperture displays balance wheel Luminous hands; exhibition screw down case back double locking clasp Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving