Covert Smoke Alarm design Mic Pure Sound AGC Cov 80m2

NV-YNCS-40 Smoke Alarm Shape Sound Monitor

• Built-in Imported chips, high sensitivity, beauty voice
• Integrated import front audio amplifier, microphone can drive directly Active speaker, DVR and recorder
• The unique design of the "electronic noise dynamic closed loop suppression circuit" can eliminate "hiss" electronic noise, realize perfect radio
• Using Dolby noise reduction technology, less noise
• Using echo eliminate technology, effectively reduce the echo
• Built in mini audio amplifier and noise reduction module 
• Automatic gain control (AGC) circuit