Siemens Transponder MDS D424, 2000 byte FRAM user memoryProduct Overview Transponder MDS D424 for RF200 RF300 ISO MOBY D button ISO 15693, Chip type FUJITSU MB89R118, 2000 byte FRAM User memory 27x 4 mm (DxH). Article Number: 6GT2600 4AC00. Key Specifications Memory & Technology: 2000 bytes FRAM user memory with Fujitsu MB89R118 chip Non volatile memory retention with unlimited write cycles High speed data read write operations Physical Construction: Button style: 27 mm diameter 4 mm height, 5 grams Epoxy