1) Hands free two-way talkback fully automatically;
2) Adopt plastic+aluminum material, elegant appearance, voice is realistic&clear; 
3) Easy installation,only one wire between master station and substation connection.
4) Volume of master station and substation can be adjusted separately
5) With record output, can connect with external recorder
6)With Microphone function, and connect with collar microphone

Spec.:

Working Voltage: DC9V
Working Current: 300mA MAX
Output Voltage: 2W+2W
Sensitivity: -46dB±2dB 20Hz~16KHz
No Distortion Rate:100Hz~4KHz
Material: High quality Aluminum+Plastic
Mater Size:11.4*7.8*4.5cm  
Substation Size:φ6.7*1.8cm
Carton: 20PCS/CTN