Description: Wireless type to protect the whole room, sensitivity can be adjusted for fixing the envirnment so to avoid fauls alarm. Functions: 1.Mollusk drive, digital signal process 8/12 bit microprocessor (8MHZ). 2.High frequency sound pressure detection. 3.All sound frequency 7 kinds frequency signal and impact analysis include inferior sound press analysis. 4.Digital filtration RFI/EMI rejection. 5.Particular mike design. 6.Adjust the sensitivity by hand can avoid the false alarm. Specification: 1. Max detecting rang:9m 2. Operating temperature: -20 ~50degree 3. Power 9~12VDC 0.15a 4. Current (static state) 5Ma 5. Current (alarm) 80mA 6. Detecting output NC 7. Anti-tamper NO 8. Yellow LED Indicate voice level 9. Red LED Indicate alarm signal 10. Operating temperature -10~50degree 11. Casing ABS fire resistance plastic 12. Weight:100g without transformer 13. Size:90x66x25mm