Thirty years ago today, on October 7, 1995 (August 13, 1995, the lunar calendar), an electronic code ring was made. On October 7, 1995, an American company successfully developed an electronic code ring that can be used to open one's home, one's computer, and withdraw cash in the bank. According to the British "Daily Telegraph" report, the chip installed in the ring successfully developed by Dallas Semiconductor in the United States can store 64,000 bytes of information. When users need to use it to open a door or open a computer with a password, they just need to hold the ring close to the door or the password recognition device on the computer. The advantage of this electronic code ring is that it is easy to carry and use.