The TR4SWVL earpiece is designed for professional use in environments where workers may share earpieces or require extended periods of wear, such as in security, retail, or hospitality. The "D-hook" design allows the earpiece to rest on either the left or right ear without being inserted into the ear canal, which is a more hygienic and comfortable solution for shared or long-duration use. The earpiece unit swivels to accommodate either ear.  The connection to the radio is a two-pin connector with a screw-down feature, ensuring a secure and reliable connection even in active situations.TR2X, and TR400 series.