Patent ID: 8693720

Claim:
A wireless communications earplug for use with a magnetic field transmitter, comprising: a) a receiver comprising a bobbin made of magnetic material having two ends and a length therebetween, and a coil of wire wound upon the length of the bobbin; and b) a speaker having a case with at least a top surface made of magnetic material, an acoustic output and an electrical input coupled to the wire of the receiver, wherein an end of the bobbin of the receiver is mounted in close proximity to the top surface of the case of the speaker, the bobbin of the receiver being oriented relative to the magnetic material of the top surface of the case of the speaker such that the magnetic bobbin of the receiver and the magnetic material of the case of the speaker provide a low-reluctance path for magnetic flux passing through the bobbin and the coil of the receiver, and directing magnetic flux from the magnetic field transmitter through the receiver, such that the sensitivity of the earplug is improved, requiring less power from the transmitter for the same output level from the receiver.