Invisible Premium Wireless earpieces are our premium amplified headsets which allow you to hear voices clearer and a magnitute clearer than the ordinary headphones included to each set. They are compatible with all of our models BT-SET, SX-SET, MP3 -SET... They are made from a special padded skin-friendly material, which provides a compact fit to the ear, the sound is louder for up to 5 times compared with our ordinary earpieces. Notice: These earpieces are an accessory to our different models, and the package only includes two earpieces without the module neckloop, microphone. These have to be ordered separately.