Etymotic ER135-QSA-PT BEAN Quiet Sound Amplifier (Single) - PlatinumFrom Etymotic Research, the T coil version of The BEAN, part of the BEAN family of Quiet Sound Amplifiers, is engineered to be used with hearing aid compatible telephones and loop systems. The Loop systems' name is based on the wire loop configuration that is placed around a room or a large area sending an electromagnetic signal to the T coil BEAN, which then in turn converts that signal to sound. The benefits are enhanced when they're used for