Description: 4 × 4 form with the number keys 0-9 and confirmation button. With 8-bit digital tube display circuit composed of tips, when to enter a password, it only displays " 8." , When finished press Enter to confirm password-digit key, enter the password for the password to compare with the settings, if the password is correct, then the door opened here with a second light-emitting diode LED as a prompt at the same time issued a " ding-dong" sound if the password is not correct to prohibit the importation of key 3 seconds at the same time issued a " tick, tick" sound alarm if the there within 3 seconds of the button is pressed, then the ban was re-key input 3 seconds prohibited.
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