Perman Luxury Mens Fashion PU Leather Glass Quartz Analog Wristwatch Noctilucent Watches Navy Band materal: PU Leather. Watch lenght: 22cm. Band width: 2.2cm. Dial diameter: 3.8cm. Dial thickness: 1.1cm. Display type: Pointer. Clasp type: Pin buckle. Shape of the dial: Round. Movement type: Quartz. How to make luminous : Watches need the illuminate of sunshine or lighting,then get luminous,and luminous can continue a certain time.