Secificatons: Monitoring of range: 5 - 150 square meters Powerful Movement Pure tone quality Support Sensitivity Adjustable Contain HIFI process chip with low noise performance that can restrain noise Support TV monitoring and security systems With the use of cameras to achieve synchronous video and audio Built-in AGC circuit For occasions: Bank, Prison, Examination place, Shopping mall, Industry factory etc. Small electricity consumption Long distance transmission Signal transmission line with core line with the best shield. Power supply: DC 6V - 12V Current consumption: 12mA Frequency range: 200 - 10KHz Frequency response: 2.5dB Output impedance: 600¦¸ Output level: 0 - 6V Approved: CE / FCC/ROHS After sales service: 1 year warranty