ibutton TM1990A-F5 read-only type of card, compatible ds1990a.

ibutton, also known as touch memory, electronic keyStainless steel package with su304#,rugged, never rust, corrosion; resistant to heat;Anti-variant; sealing strong;

for security patrol, sauna door locks,electronic door locks, door intercom, card systems, identification, banking,Communications, rail transportation, transportation, and so many fields