| Function / Model name | BF-20 | BF-50 | BF-333 |
| Multi-door or Single-door controller readers support |
BF-630/BF-830 BF-660/BF-670 BF-880/BF-870 Webpass |
BF-660/BF-670 BF-880/BF-870 SEMAC |
BF-660/BF-670 BF-880/BF-870 SEMAC |
| Watch Dog built-in | Yes | Yes | Yes |
| Working Voltage (DC) | 9-24V DC | ||
| Working Current (mA) | 300mA | <900mA | 200mA |
