Cordless, invisible micro ear piece for maximum listening discretion in surveillance activities This invisibleMicro Earpiece (Secret Ear), is the cordless alternative to the standard wired earpiece. Secret Ear is cordless and virtually invisible to the eye. It ensures complete covert reception from any cellular phone. It enables you to listen to conversations where the cell phone has been placed, with maximum convenience, clarity and discretion. This is the latest step forward in miniaturization of electromagnetic technology, measuring just about one and a half centimeter (long) by half a centimeter (wide) with no loss of sound quality because of its size. Easy to fit and use, Secret Ear is just as clear in sound as the standard wired earpiece, but with the added benefit of being more discreet in use (and there are no visible wires). Secret Ear is employed extensively in the field by Intelligence Services of most developed countries. It therefore meets the maximum listening discretion required by business or personal surveillance. Its peculiarity is that it works with both transmitters and cellular phones. Although it is adaptable with any cellular phone, but while ordering kindly specify the model and make of your cellular phone or transmitter. The Ear-GSM kit for cellular phones can receive voice signals from an infinite distance. Now also available with bluetooth collar, to quietly communicate from unlimited distance! Micro EarPiece Secret-Ear technical data Micro Ear Piece Secret Ear receives signal, by inductive coil, across electromagnetic fields Receiving distance: 50?70 cm (not for Bluetooth solution) includes: Micro Earpiece Secret Ear Inductive coil Wire connector for cellular phone with microphone and answer push-button