QNAP Security NVR-101 (Version: 2.8.0) - Manual (Page 63)

5.5.1 Create user
User Name
The user name cannot be pure number. It must not exceed 32 characters. It is
case-insensitive and supports double-byte characters, such as Chinese, Japanese,
and Korean except:
" / \ [ ] : ; | = , + * ? < > ` '
Password
The password is case-sensitive and can be 16 characters long at maximum. It is
recommended to use a password of at least 6 characters.
Enable this user to perform system administration
Assign administration right to the user.
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