Square Mechanical Watch: Combines square and round design on the same watch, highlighting the unique shape of the watch through different curves, square case and round dial beyond the traditional watch shapes, the dial design is inspired by the dashboard in the cockpit of the aircraft.Strong luminous hands and markers adopt imported luminous material, long-term lights and short light absorption, you can read time easily in the dark night. 2mm sapphire mirror, more scratch resistant.Water resistant to 10ATM(100M). Strong waterproof, it will be a great swimming partner. Wearable around sinks, bathing, swimming, athletic sports in shallow water, but not suitable for snorkeling or scuba diving. Seagull Automatic Self-winding Watch: Seagull automatic self-wind movement provides energy for your watch, doesn't need batteries. The watch is powered by your wrist movement. You can also manually wind up the watch to keep it work well. (By rotating the crown 20 laps.)When using for the first time, please manually wind up the crown to drive your watch. If it doesn't get enough energy, it will have a large deviation or stop working.In order to prevent from damaging the movements during date setting, we have specified a time period for the customer to set date, please set the date when the watch hands point to 6:00-9:00. Square Automatic Watch Movement: Seagull Automatic MovementWindow: Sapphire CrystalFeatures: Luminous; Calendar; Waterproof; Scratch-proof Waterproof Wristwatch for Men: Case Material：Stainless SteelBand Material：Genuine LeatherBand Clasp：Hook Buckle Men's Sports Mechanical Watch: Weight: 130gCase Diameter：1.65 inchesCase Thickness：0.51 inchesBand Length：10.24 inchesBand Width：0.94 inches FEICE FM019HOT FEICE FM221Pro FEICE FM121 FEICE FM202 FEICE FK037 FEICE FK220 Movement Automatic Self-Wind Automatic Self-Wind Automatic Self-Wind Automatic Self-Wind Japanese Quartz Japanese Quartz Battery None None None None ✓ ✓