LF 125Khz Read Only RFID Keyfob is made of ABS material with rfid chip and antenna . It will be durable and injection ABS case then sealing rfid chip under ultrasonic machine without any space sideview so that you can use them in out-door harsh environment and waterproof .It will fully compliance with ISO11784/ISO11785 125khz frequency rfid chips ,such as EM4200 ,TK4100 or Hi-tag chips ,ATMEL 5577, etc .This kind of rfid keyfob can custom different kinds of frequency chip such as 125khz , 13.56mhz and 860-960mhz for different application with different reading distance .widely use for door control access, identification ,etc . Customer logo printing and abs case color can be optional .