... energys and your imune function.3. Light weigh(10 g), variety colors, fashion design, water resistance(3 M).4. Negative ion emittance ... or customer designed size, could supply sizes for 14CM, 15CM, 16CM, 17CM, 18CM and 19CM(circumference).7. Colors: Any colors ... good quality.11.Other names: digital ion silicone watch, digital sports silicone watch, silicone watch , anion silicone watch , sport watch , ...