ER-102 Key Phone Headset Amplifier

          ER102 is design for the convenient usage of key telephone, specially for those who online all the time.The amplifier gets the power from the telephone line cable, not need to load any battery or plug external power supply .  User can easily adjust the volume of headphone and microphone for best performance.
　

● Line powered
● Headset volume adjust
● Microphone volume adjust
● Switch for different types of handset
● Switch for different types of phone
● In use indicator
● Audio output jack for recording