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1990a-f4 serial number ibutton is a rugged data carrier that acts as an electronic registration number for automatic identification. we provide ibuttons, keyfobs, wristband for different use style. the 1990a-f4 is smaller size compared with 1990a-f5, other function is the same. the button size is 10mm dia, height 4mm. the key total size is 38x15mm.1990a * upgrade of ds1990 allows multiple serial* number ibuttons to reside on a common bus* unique 48–bit serial number* low-cost electronic key for access control* 8-bit crc for checking data integrity* can be read in less than 5 ms* operating temperature range of -40c to +85c? application:access control / guard tour system / security patrol / sauna door locks / electronic door locksabout gyrfidgyrfid is a leading supplier of smart card`s and rfid tags products for global system integrators and distributors. it offers a wide range of products embedded with chip and less chip (lf, hf, uhf), which encapsulated into variety shapes like iso card, keyfobs, wristband, disc tag, laundry tag. the products are widely applied in access control, payment system, inventory control, asset tracking, industrial managements. gyrfid also welcome oem service and personalization to create value for the sponsors.
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