AAA level customized self-winding mechanical movement which power reserve up to 40 hours. This CIGA Design Z series watch will come with two straps: one food-grade silicone strap & one black genuine leather strap to meet your needs for different occasions. The original sweat-proof bump design of the silicone strap provides ergonomic comfort to your wrist. The case is made of Titanium material which is 40% stronger than stainless steel but 30% lighter than it. After repeated polishing, the case is durable. It also has the characteristics of high-temperature resistance, lightweight, skin-friendly, etc. Carved from titanium ensures life-long durability and superior strength.3 ATM waterproof grade mean it can prevent water splash when washing, accident water splash or sweating Design Z series seize every powerful moment and let them explode on your wrist. With the Z series, you can hear the heartbeat of a movement. Designed and engineered as a multi-page book, the packaging that surrounds our watches is as majestic as its contents.