Banana Bros OTTO GrinderBanana Bros OTTO Grinder The OTTO Grinder brought to you by Banana Bros is a cutting edge battery powered automatic grinder. Equipped with patented SMART technology, automatically detects the consistency of the material you are grinding and adjusts it's motion to deliver an excellent grind every time. This grinder comes with a long lasting built in lithium ion battery that offers 20 30 rolls on each charge. Included is a rapid USB charging cable.