RFID tag, Coin tag is optional with 30/40/50mm dimension. Fill the tag with epoxy is an option for outdoor application. Anti-metal layer option is to mount it onto metal. Applications for the Coin tag: Process Control & Factory Automation Item Identification Security Patrol checkpoint Key Features: Dimensions: Dia 30/40/50mm Hold diam for screw: 5mm Thickness Option: 5mm/5mm/8mm Housing: ABS Ultrasonic plastic welding; Or Filling with epoxy Water-proof: Yes, IP67 Operating Temperature: -20 to +60 Stockage Temperature: -20 to +65 Optional RFID ICs: 13.56MHz: Mifare 1K/4K/Ultralight (NXP) ISO14443A; I CODE SLI ISO15693; Tag-it HF2048; 125KHz: EM Marin EM4102/4100; 125KHz Unique GK4001; Hitag1/2; Atmel T5567; Reading Range: Depanding on RFID technology and reader design Optional function: Whole tag fill with expory Anti-metal layer Customization Support: Silk-Screen Printing LOGO Laser Engrave LOGO Jet Printing Serial Number Laser Engrave Serial Number