... &Tourmaline2,This ion silicone watch can emit negative ions and infrared which made you calm,soothe and relax your mind,also ... concetration,ehance your energys and your imune function.3,Light weight(10g),variety colors ,fashion design,water resistance (3ATM)4, ... competative price with good quality.11,This is ion watch, sport watch,fashion watch, silicone watch ,bracelet watch,rubber watch and so on.