Voltage: linear power supply (transformer) dc 9-12 v
Electric current: 20MA
Frequency range: 100-100 KHZ
Output impedance: 600 ohm non equilibrium
Connecting mode: red (DC) white (RCA)
Audio Monitor Range:10-50sqm
Sensitive:-38db
SNR(Signal to Noise Ratio):70db
Apply to Hikvision, dahua, hanbang and other DVR
Working Environment::-30 Degrees Celsius ~60 Degrees Celsius