?This is ID Card Keychain Door Access Control Blue TK4100. It is used in patrol system£¬ attendance systems£¬ access control systems£¬ enterprise systems£¬ radio frequency identification field etc..                                    Features            Small and exquisite appearance£¬ durable£¬ does not fadeYou can hang it on the key ring. Very easy to carryThis ID card spray one inner code on its surfaceData storage using EEPROM£¬ the data stored for more than 10 yearsA total of 64-bit data storage capacity£¬ including manufacturers£¬ distributors and users of the codeThrough special equipment£¬ you can copy the same number ID cardTypical Applications: Patrol system£¬ attendance systems£¬ access control systems£¬ enterprise systems£¬ radio frequency identification field                                                            Specifications            Chip    TK4100    <br>Operating Frequency    125KHZ    <br>Sensing Distance    8 - 20 cm    <br>Working Temperature    -10 ~ +50¡æ    <br>Material    Plastic    <br>Color    Blue    <br>Size    2.8 x 3.5 x 0.5 cm / 1.1 x 1.38 x 0.2 inch (L x W x H)    <br>Weight    5g / 0.18oz    <br>                                                            Package Includes            10 x ID Card Keychain Door Access Control Blue TK4100