... -inOutput Connector Power+, Audio and GND Cable 3 x 0.5mm2 RVVP cableVoltage DC 12V (8 ~ ... 160gStandard CE FCCIntroduction:*Excellent voice expearance, the best model of Tradio series.*Low noise,low echo and clear ... can reach 3km. shield *Cable is required: 3 x 0.5mm2 RVVP cable, 4 core phone line, ... big house.*According with CE standard. X.TRADIO High- Fidelity, high-class audio surveillance microphone