Adjustable Settings: This adapter is a brand-new upgrade in terms of functionality and appearance based on the old version. The adjustable settings allow it to be compatible with devices that require 2-4 AA battery charging simultaneously, meeting your diverse device usage needs. No Need for Frequent Battery Replacement: This adapter is used to replace regular batteries and can provide continuous power to your devices 24 hours a day. You no longer need to worry about the battery running out and having to replace it.