Made of hard plastic with one B22 socket and two 4mm banana plug terminals. Can be used inline with other components of Eisco Series PH1029 Accepts size B-22 (22mm) bayonet type bulbs CE Certification Bulb not included Power Source needed for operation. An economical Eisco power source is PH0971DCAC which is not included Made of hard plastic with one B22 socket and two 4mm banana plug terminals. Can be used inline with other components of Eisco Series PH1029. Accepts size B-22 (22mm) bayonet type bulbs. CE Certification. Bulb not included. Power Source needed for operation. An economical Eisco power source is PH0971DCAC which is not included