Pickup range: 150M2 Audio transmission distance: 3000 meters Pointing features: omnidirectional Sensitivity:-30dB Signal-to-noise ratio: 85dB Dynamic range: 100DB Maximum sound pressure: 120DB Output impedance: 600 Ohm unbalanced Number of microheads: double microheads Signal processing circuit: professional audio processing Waterproof characteristics: outdoor waterproof Scope of application: post office, paying hall, outdoor intercom, etc. Protection circuit: -strike protection, power supply polarity reversal protection Connection method: power cord (red), audio (white or yellow), public area (black) Transmission cable: 3-core 0.5MM RVVP shielded cable Power supply voltage: DC voltage regulator DC12V Color: Silver Material: Aluminum Alloy Package Contents: 1 x Sound Pickup Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.