1、Touch keyboard password lock, no keys needed. Great and convenient for use. 2、Temporary password can be set, which can only be used once, and automatically expires after use, safer and reliable. 3、Has obfuscated password function. You can enter a string of numbers before or after the correct password to confuse bystanders. 4、Supports password error alert. Enter the wrong password four times in a row, the keyboard is locked for 60 seconds, and the alarm is activated. 5、When the battery is low, just take out the old battery and replace new battery, without losing the password. Also supports external USB emergency charging to unlock. 6、Made of superior and quality zinc alloy material, firm, beautiful, safe and durable. 7、Suitable for schools, SPA/sauna bath centers, swimming pools, gyms, golf courses, supermarkets, hotels, companies, factories, homes, businesses, etc.