Product Name : Static DischargerMaterial : PlasticSize : 6.3 x 2 x 0.9cm / 2.5" x 0.8" x 0.35"(L*W*T)Keyring Diameter : 2.5cm/ 1"Main Color : Silver TonePackage Content : 1 x LCD Anti Static, 1 x KeyringNet Weight : 9gEscape from shock due to discharge of static .Release static security within the human body in 0.2-3 second.LCD shown by the electrostatic charged on you.Key holder design.This anti-static is to eliminate static .Can safely and effectively eliminate the hazards static.No battery need. permanently. Easy to , hold the key chain, then contact electric conductor (such as car, computer, metal stuff) with this product.Note:Light and different displays may the color of the item in the a little different from the real thing.The measurement allowed error is +/-1-3 cm.