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Consumer Alert: Most users do not need a license to operate this wireless microphone system. Nevertheless operating this microphone system without a license is subject to certain restrictions: the system may not cause harmful interference; it must operate at a low power level not in excess of 50 milliwatts; and it has no protection from interference received from any other device. Purchasers should also be aware that the FCC is currently evaluating use of wireless microphone systems and these rules are subject to change. Mini wireless earpiece is a micro-mini wireless inductive receiver which transforms audio signal through electromagnetic induction. These products make the covert communication possible when it is inconvenient to expose earpieces. earpiece is widely used in many departments . Using this device;You can hear the voice from the person other sideand the person of the other side can also hear your vioce. How to use 1. Open battery door install the battery perfectly and push battery door into battery box gently. Put the earpiece into ear canal by holding the handle and the slight sound of current indicate working order. 2. Adjust the volume of drive equipment to reach satisfaction. 3. Set mobile phone to automatic return or vibration. 4. Put the inductive loop around your neck and connect the inductive loop to the drive equipments mobile phone radio which are attached to or beneath users clothing. One transmits message with radio the other wearing an earpiece and inductive loop who also has a radio can hear the message very clear. Because the inductive loop inducts the message from the radio to earpiece and then earpiece transforms the electromagnetic inductive signal to audio signal to reach the wireless inception. Communication distances and radio power are the direct proportion. You can communicate with others freely once network exist when you use mobile phone Specification Size : 5x7x10mm Shape : anatomical shape Receiver type : magnetic/analogue Maximmum volume : 110dB Battery : sony sr416sw/337 Battery Life : 8h Net Weight : 0.8g Package Content 1x Earpiece 1x Loopset 1x Battery – 337 SR416SW