Einstein Shock Collars are trying to change the industry and currently pride themselves for making shock collars which use the lowest levels of stimulation available. Through small corrections you can still train most any dog to bring about desired changes which will make owning your pet so much easier. Currently all their units are rechargeable which is great and keep in mind when choosing one of these Einstein shock collars that they are designed for specifically sized dogs so each unit isn’t one size fits all. Einstein shock collars catalog of products however should suit any owner’s needs.