High Sensitive CCTV Microphone Hidden Samll Type for Security System Box Sound Monitor With 2 Audio Pickup Mini Monitoring Description Using left and right channel output, Micro-chip design, High fidelity. Voltage :6-12VDC; Frequency response :100-5500HZ;Range: 50 square meters. Parameter 1.Voltage: linear power supply (transformer) dc 9-12 v 2.Electric current, 18MA 3.Output impedance: 600 ohm non equilibrium 4.Connecting mode: red (DC) white (RCA) yellow (RCA) 5.Apply to sea kang, dahua, hanbang and video recorder 6.Weight:26g 7.Size: 43mm*22mm*10mm Details Images Packing Package Included: 1 x microphone,,1 x user manul,,1 x bag