Anti-burglar system, installation and maintenance

Electrical wiring and fitting

電線鋪設及電器裝設

Electrical fitting with water plumbing

電器裝設兼水管鋪設

Fire alarm and fire fighting equipment, installation and maintenance

火警及滅火設備安裝及保養

Intercommunication system, installation and maintenance

閉路通訊系統安裝及保養

Telecommunications equipment, installation and maintenance

電訊設備安裝及保養

Combined and other installation and maintenance of electrical and mechanical equipment

綜合及其他電器及機械設備安裝及保養