221 Single-Ear Stereo Custom Earphone

Sound Signature: full-range, accurate; true stereo within a single earpiece Drivers: twin balanced armature drivers for full left/right in single earpiece Designed specifically for music lovers with unilateral hearing loss (deaf in one ear), the 221 delivers full stereo signal to a single custom earpiece without sonic compromise. Works with any standard portable device, combining left and right acoustically within the ear canal without the sonic compromises inherent in passive electrical summing.