An inductive MP3 player is a great solution for hidden communication. MP3 player consists of insulating inductive coil, microphone and strong rechargeable battery which allows you to listen to your prerecorded files during your exams.
With the wireless remote control you can control your MP3 player from your pocket. Built-in Next/Prev, Play/Pause keys are great for playing voice clips.
No one will ever know that you are listening to your prerecorded files. The inductive coil creates a magnetic field and drives receiving coil inside an invisible earpiece which must be located within magnetic field.The radius of magnetic field created by inductive coil is approx 40cm. The MP3 player Box has a built in microphone, so that you can recorder your notes without a computer. For storage it uses TF card (not included). If the invisible earpiece is within magnetic field, you will always hear clear sounds. This item is in the category "Consumer Electronics\Portable Audio & Headphones\Headphones". The seller is "henglystar" and is located in this country: CN. This item can be shipped worldwide.