Specification Brand : YARONGTECH BulletPoint1 : Original T5577 Chip,it doesn't have pre-programmed id number,so need to write the id on it before you read BulletPoint2 : it's rewritable chip,and it can write in 125khz id format and H ID WG 125khz format BulletPoint3 : Please note it can't be read before you program the chip BulletPoint4 : can write by 125KHz RFID writer/copier BulletPoint5 : Blank White Card,Printable by Zebra,Fargo,Evolis Card Printer Color : 100 PACK ExternallyAssignedProductIdentifier1 : 725350788513 ExternallyAssignedProductIdentifier2 : 4890023604912 ExternallyAssignedProductIdentifier3 : 0725350788513 ExternallyAssignedProductIdentifier4 : 4890023604431 ItemName : YARONGTECH-125khz writable rewrite blank white t5577 Plastic RFID hotel key card (Pack of 100) ItemPackageDimensions_Height : 12 centimeters ItemPackageDimensions_Length : 6.4 centimeters ItemPackageDimensions_Width : 9.8 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : home-security-systems Manufacturer : YARONGTECH ModelNumber : 4331029471 PartNumber : T5577THIN ProductDescription : 1.T5577 Chip 2.125khz. 3.rewritable chip. 4.blank white card,printable by sublimation printer,but can't support inkjet printer. 5.credit card size. ProductSiteLaunchDate : 2016-07-26T03:14:53.423Z UnitCount : 100