This Hosa Audio Adapter female end accepts a mono signal and applies it to both Tip and Ring contacts at the male end. Use it to send a mono singal to both left and right contacts in a stereo 1/4" jack. This adapter can also be used to "trick" and audio mixer's insert (send/return) jack into behaving like a direct output.
In the Box
Hosa Technology Audio Cable 1/4" TS Phone Female to 1/4" TRS Stereo Phone Male Adapter