We are engaged in trading and exporting excellent quality RFID Silicone Wristband Default Post Color Access Control Card in Shenzhen, Guangdong, China. Built in 64bits Unique ID number Frequency : 125Khz chip TK4100 Diameter : 74 mm water-proof ,Acid-proof ,Alkali-proof , Resistant to oxygen , ozone and sunlight,Anti-adhesive operation temperature : -40'C to +85'C Package: 5x RFID 125khz id Silicone wristband Bracelet, for color post random!