Green to be seen. Self-winding, sistem GREEN (SUTG400) features two of our favorite colors: green with orange accents. A sun-brushed green dial and green translucent case and bezel feature orange and red prints, whilst the green silicone strap has been stitched with orange to continue the contrast. Flip it over to reveal exquisite craftsmanship underneath. Sistem51 has no need for a battery-it's powered by the person who wears it, so it features an ' automatic ', or 'self-winding' movement.