The Westone Audio T2 Connector: Designed and patented by estron a/s. The focal point of the T2 connector system is minimum wear on the socket part, which ensures the longest possible product lifetime for earphones and IEMs. This T2 connector system is a well proven alternative to the standard MMCX and 2Pin connector solutions. Compatible Models: Made for Etymotic EVO | Multi-Driver Earphone, and compatible with all series monitors that feature a T2 connection.