Drive Circuit Built-In Type
| Model no. | Spec. | Dimension | Download |
| OBO-1206C-A2 | 85db min. at 2300Hz/6VDC | 12 dia. * 9.5mm |  |
| OBO-1212C-A2 | 85db min. at 2300Hz/12VDC | 12 dia. * 9.5mm | |
| OBO-1203D-A2 | 83db min. at 2300Hz/3VDC | 12 dia. * 7.5mm | |
| OBO-1205D-A2 | 83db min. at 2300Hz/5VDC | 12 dia. * 7.5mm | |
| OBO-1212D-A2 | 83db min. at 2300Hz/12VDC | 12 dia. * 7.5mm | |