When you buy Geniesori, the basic earphone that goes into the package is stereo.

Earphones are consumable, so if you want to purchase additional ones, please refer to the description below:  

1. I can only hear it in one ear. (Mono) -> UW-01

2. I have to hear both ears. (Stereo) -> UW-02

(If you purchase the item, it will be sealed and delivered by regular mail, and you cannot get a refund after trying it.)