1. Always Chip T5577 is better quality and more expensive than cheaper EM4305. 2. Chip T5577 does not have a written code immediately, the code appears only after writing, unlike EM4305, it has a code immediately. 3. For example Expensive Russian-made duplicating equipment requires only a good quality T5577 chip.

     Some Chinese-made copiers only record the i T5577 chip
    Another China-made copier recorder i EM4305
    The third Chinese production group duplicating equipment is universal, that is, records both T5577 and EM 4305 and also other chips.