內含線路
| 型號 | 規格 | 尺寸 | 規格書 |
| 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 | |