Industry:
- 全部
- Normally open type
- type conversion
- opening and closing
- two open two closed
- normally closed
- three open two closed
- other
- 全部
- Domestic
- SONGLE / Song Music
- HONGFA / Acer
- OMRON / Omron
- PANASONIC / Panasonic
- SONGCHUAN / Matsukawa
- import
- TYCO / Tyco
- HKE / Harbour
- HK / Health Division
- TIANBO / skywave
- OEG / Wang Li
- KET
- NEC
