* Suit for dynamic state and realtime record, broadband transmission.

* Tone clear, adjustable range 20m2.

* Sony microphone inside, high sensitivity adjusted resistance.

* Suit for bank, office and meeting room.

* Working volt: 4~14 V

* Work current: 5 mA~60 MA

* Frequency: 50~~10000 HZ

* Sensitivity: 200mA/ubar

* Maximum output Voltage: 5 V-up