Have you heard of a Servitor?

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I was recently browsing on ebay and after seeing a beautiful wolf and butterfly neckless typed in a broader search. I came across a site where there were pendants that were described to contain a Servitor bonded to it. This is something i have never known before and as i've always been pretty interested in the supernatural it surprised me. The description was as follows "This spirit entity is a construct, also known as a servitor, artificial elemental, energy golem, or thought form. A construct is an entity that has been created by a person or other entity. Psychic energy is given a form, and 'programmed' with the traits and behaviors that are desired. It can be created in any form, and given any traits or abilities that it is within the power of the creator to give it. Construct entities can be fully sentient (intelligent and self-aware), and some may even evolve over time into other types of spirits. Our guardians are real spirit entities which are intelligent and possess a full emotional range. They have precisely the traits we have given them, so will behave reliably and remain loyal. They are protected against tampering or changes from outside, and all are fully capable of continuing to learn and develop over time, so that they may serve their primary purpose (protecting and aiding their owner) better. This servitor will defend the person who wears or carries this item, and will also obey and defend its owner so long as the item is within 100 feet of them." I'm a little unnerved about getting the item although it's really pretty. Is this safe? Is it trapping or manifesting something it shouldn't? I'm really not aware of this concept before and so have little knowledge. Have you heard of it before? Would you buy it? What do you think?