Screaming O uses the popular AG-10 Alkaline batteries for their collection.  They are small, compact and long lasting.  

Convenient 6-pack of replacement batteries. These AG-10 batteries power up the companys lineup of smaller vibrating rings.

Convenient 6-packs of replacement batteries. Compact dispenser holds 12 packs of 6 replacements. These AG-10 batteries power up the companys lineup of smaller vibrating rings.