36mm Waterproof Seiko Watch Movement with Black Dial • Movement: Quality Seiko watch movement. • Bezel Diameter 36.6mm fitted with Silicone rubber gasket. • Long-life battery already installed. Simple to replace, long-life battery already installed. • Luminescent hands and hour markers on the dial. • Stainless Steel cases. Instruments feature stainless steel cases and mineral glass crystals. (Heavy-duty components, no cheap plastic here!). • Rugged instruments. These gauges are designed specifically for Motorcycle/ATV/Marine installations and are warranted against Vibration, Water and Shock.