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Note: You can't add them to RFID locks directly. You must write records into them by way of a 125kHz RFID card writer use. They are clean tags, no information inside. Sensing Distance: 2 to ten cm (1 to 4 inch); Data Storage Life: 10 Years & Rewritable Frequency: a hundred twenty five KHz Chip type: T5577 Type: Read and rewrite key tags Waterproof: Water resistant Colour: blue Material: ABS Size: about 27 x 35 x 4mm Package Contents: 50 x Writable 125kHz RFID Key Fob Only the above equipment content, other item shouldn't included. Note: Light and diverse exhibits may cause the colour of the article in the photograph a bit diversified from the real thing. The measurement allowed error is +/- 1-3cm.