Some embodiments of the present invention provide an adapter including one or more electronic components contained within a housing for attachment to eyewear. The housing may include a main body extending in a lengthwise direction, the main body having a front section and a rear section defining opposite ends thereof and a middle section disposed between and connecting the front section and the rear section, and an attachment portion protruding from the main body in a widthwise direction, the attachment portion configured to connect to a portion of a temple of an eyewear frame, wherein a width of the main body decreases from the middle section toward a front end of the front section.
