1. Main (internal) Speaker 1pcs
2. Deputy (outside) Speaker 1pcs
3. Installation clamp 4 sets
4. User Manual 1 copy
5. Transformer (DC9V) 1pcs

1. Streamlined appearance host, unique all-metal design, standard painted circular extension, air plugs. Compact, good looks, inside and outside is only one connection, simple installation.
2. The host is aluminum panels, comes with long microphone, extension equipped with a microphone, no external microphone, automatic handsfree direct two-way intercom.
3. High-quality speaker, playback vivid, clear, the volume of inside and outside  can be adjusted individually and indicator tips.
4. microcomputer processing circuit, mute function, unique channel interlock circuit, solve the echo, howling problem.
5. the host has recording jack, internal and external dual audio signal output (with the bank teller system recording).
6. can be used to any window difficult to talk . Apply to banks, securities windows, bus station, ticket office,  factories intercom and so on.

1. The host installation in the workplace, the extension is installed outside the workplace (with double-sided adhesive mounting), connect the extension's plug into the host's  "extension" jack.
2. Insert the DC 9V adapter into the 220V mains supply , insert 9V DC plug into the host of "Power" jack.
3. Press the Power "switch" of the host, the red power indicator light, means power supply is working properly. speak within 50cm of the host, sound inside spread out from the outside extension; the customer's voice outside 
  spread out from inside hosts,  indicating two-way intercom working properly.
4.  The "microphone" jack of the host can connect an external microphone, direct access to external microphone and extension achieve two-way intercom.
5. when needed to record internal and external voice at the workplace. It can be connected to  the "record" hole
 of the host output sound signal.
6. the machine has been set dual-channel, maximum volume  "6" for the best results, you can turn down a channel according to the actual needs.

Phenomenon 1: Silent
1. 220V power is not plugged in, the power supply should be plugged.
2. four-core cable plug or DC power plug loose, please seated.
3. did not turn up the knob, adjust knob.
Phenomenon 2: whistle
1, the installation environment is poor of sound insulation , should be further distancing the host and extensions.
2, noisy environment, adjust the volume knob to the smaller.
Phenomenon 3:  Client earpiece sound too quiet 
1, the inner volume is too small. adjust knob.
2, the customer is too far from the station.
Phenomenon 4: intermittent sound, can not even transfer
1, the speaker is too far from the microphone(less than 50cm ideal).
2, when one is speaking, the other to grab the words will be suppressed.
3, ambient noise is too strong, you can adjust the volume knob of the corresponding channel, or require the speaker close to the microphone.