Spesifikasi: - There is a mounting screw hole 3mm - The use 5v DC power supply - With analog output - There are threshold level output flip - High sensitive microphone. - Builtin power LED indicator and comparator output LED indicator - Microphone sensitivity (1Khz): 52-48dB - Microphone Impedance: 2.2K - Microphone Frequency: 16-20Khz - Microphone S/N ratio: 54dB Visit Tokoduino dot com