Quality diaphragm, clear call
Smart microphone
Length enough
Clearly instruction and easy to use
Clear and distinguished voice
Streamline design
Specification:
Working voltage: AC9V/1A
Main sound (sub sound): 3W
Inside microphone: -48db 20Hz-20KHz
Outside microphone: -48db 20Hz-16KHz
Exterior size: 158x87x46cm/78x20 mm
What you will get
1 x Retevis RT-9908 Dual-way counter interphone
1 x External speaker
1 x Charger
1 x English User manual