General DescriptionAH100 is designed for the convenient usage of key telephone, especially for those who online all the time. The amplifier gets the power from the telephone line cable, no need to load any battery or plug external power supply. User can easily adjust the volume of headphone and microphone for best performance.Key Features- Hands-free talk with speaker and microphone- Line powered- Headset volume adjustable - Microphone volume adjustable- Switch for various types of handset- Switch for different types of phone- In use indicator- Switch for handset and headset- Audio output Jack for recordingElectrical CharacteristicsCurrent: Idle<0.1mA / In use < 50mAImpedance: 4 R +/- 15%Speaker: 32R 0.5WOutput: 1WDistortion: 5% MaxSound Pressure: 89 +/- 3dBFrequency: 0Hz ~ 10KHzMicrophone: 62 ~ 65dBDirection: FullSensitivity: -42 +/-5dBFrequency: 20 ~ 20KHzPacking ContentsHeadsetHeadset amplifierUser guideSpecificationProduct: Headset for Key TelephonesItem No.: AH100Dimension: 95(L) x 65(W) x 23(H)mmWeight: 150gCable: 80cm