Working Procedure: The transmitter, namely the wired earphone which is connected to the phone, can transmit the signals to the mini earphone well with little disturbance. And the mini earphone can receive the signal very well. And what's more, the wired earphone can be connected to Nokia, Samsung, Motorola and other branded mobile phones. Use for: 1.passing exams or taking tests 2.making speech at a meeting or negotiations 3.working as a security guard 4.playing games or gambling at casino etc. The invisible earpieces are cordless devices. They are virtually invisibly fits into the ear. It ensures complete covert reception that delivers a whisper from netloop transimitter or wallet transimitter. This enables you to listen to conversations with maximum convenience and discretion. Because of tiny size, the invisible secret service earpieces for maximum listening discretion in surveillance activities.