Smart Card RFID T5577 125Khz EM4100 T5577 Chip Rewritable Waterproof 25mm Proximity Rewrite ID Coin Blanks 25mm Tags with round sticker althiqahkey 50 pieces

Writable & Rewritable：They are empty RFID tags without data. They can repeatable reading and writing 100000 times. You need to write data to them for use. Compatible with RFID duplicators of 125kHz frequency, Features: Waterproof, dustproof, durable, Frequency /Chip: Frequency 125kHz, chip t5577, sensing distance 1-4 inches, Size /Package: Single size 1.4 * 1.1 * 0.2inch, Wiping life: more than 100,000 times