Dimension : Diameter 4.0cm x Thickness 0.4cm Materials : 100% Embossed Solid Acrylic Built-In NFC Microchip Special Features : Tap the coin on the top bottom of your iPhone/Android, the unique serial number will be detected automatically. Please make sure your phone equipped with NFC features, and you must set the NFC mode is ON. Packing : Acrylic Collectible Coin…