p>Simple Trouble Solution: 1. Noise. The sound insulation of the installation environment is too poor. The cargo environment is too noisy. The distance between the host and the auxiliary machine should be increased or the volume should be turned down. 2. Silent. The power cord is not plugged in or loosened. The 12v transformer should be inserted into the jack of the host (power supply). The volume knob is not turned up. Adjust the volume knob clockwise to turn up the sound. 3. Cut off the sound. The speaker is too far from the microphone, should be closer (less than 20cm is the ideal distance) Features: ★Quality diaphragm, clear call Retevis RT-9908 Window Intercom System have the quality diaphragm, it will keep your communication clearly and smoothly. ★Clearly instruction and easy to use There are clearly instruction for every button,and it is easy to use for your group.Tip lights will remind you if your voice have been transmit successfully. ★Clear and distinguished voice Comprehensive application of electro-acoustic technology experience, the selection of high performance electro-acoustic circuit design, the output power up to 3W, voice clear and loud voice distinguished high Specification: Working voltage: AC9V/1A Main sound (sub sound): 3W Inside microphone: -48db 20Hz-20KHz Outside microphone: -48db 20Hz-16KHz Exterior size: 158x87x46mm / 78x20mm
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