Ion sport watch 1) negative ion is called longevity element, which is a natural cleaner of the air and vitamin in the air. It has been confirmed by medical workers that negative ion has the ability of sterilization and can clean the air. Negative ion can relieve fatigue, and keep the balance of body, remove nerve fatigue, promote blood circulation, and increase metabolism. All these contribute to relieve fatigue, alleviate muscle pain, increase immunity and concentrate energy etc. 2)recuperate physical fitness after sports, alleviate sports fatigue and prevent sports injury. 3)promote blood circulation and metabolism, enforce immunity, and improve body constitution. 4)alleviate fatigue, muscle pain, neuralgia, and migraine. 5)facilitate sleep, stabilize nervous system, promote cell regeneration, and prevent ageing. 6)improve concentration and boost work efficiency. 7)isolate electromagnetic radiation, such as cell phone, computer, television and other electronic devices. Net weight:10g Loss weight:40g Minimum order:500 pcs