Battery operated vacuum deivces are powered by batteries of various sizes depending on the model. People who purchase battery operated systems generally do so because the device works a little faster than a manual hand pumps or they may have dexterity problems with their hands. For overall best value, check out the ErectPro Battery System. There is no efficacy difference between manual and battery operated devices. For more information, Call Reach Medical, Inc. or contact us via the web on our contact page.