... (Form C), switching capacity 2.5KwGSM Bands: GSM 850/900/1800/1900MhzOperating Temperature: -20Degree ~60DegreePhysical size: 130 x 100 x 50mm ... x 2CH GSM remote control relay panel(GSM 850/900/1800/1900MHz Quad Bands,Worldwide usage!)* 1 x RS232 PC programming ... SMS Remote Control Relay Output Contacts Switch Box 850/900/1800/1900Mhz,2Channel Outputs, waterproof