Ruth's sister 20 internal power cable

Compact wireless earphone for solo listening

The Ruth's sister 20 internal power cable is a tiny single earbud that pairs with a phone or player for private audio. It fits inside one ear and includes a charging case so the bud can be replenished between sessions. The design targets users who want a minimal, cable-free way to hear calls or music on one side only.

Bluetooth audio limited to four hours per charge

The earbud delivers roughly 20 hours of total listening when combined with its case, but a single charge lasts only four hours. Button controls on the bud handle playback and calls without a companion app. Users needing all-day runtime or stereo sound will find the single-sided, short-duration format restrictive.