1. Pregnant women, children, the old man, patients.2. People who use mobile phones,computers,electronic devices often.3. People who often use Tablet PC, ,Computer,Air conditioner,Refrigerator,Microwave Oven, Printer,Washing machine, medical and office automation equipment.4. People living or working in the vicinity of high-voltage, substation, radio, radar station, and electromagnetic transmission tower.Colour: BlackMaterial: Volcanic rocks andPendant size: . 4.3 x 4.3cmImproves circulationEnhances cellular permeability, nutrition and detoxificationImprove , endurance & strengthAlleviate soreness, aches & pains, and improve flexibilityEnhances the immune and endocrine systemsIncreases energyHelps to retard the ageing processCalm the mind & improve focusStrengthen the body's -energy field to protect from harmful electromagnetic wavesPackage Contents:1 x Energy PendantOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.