I'll downgrade this one star because at first this seems a bit "hit and miss" as another reviewer
wrote. However the video instructions by Mark Mason are so super that the way to increase the
dependablity is clear. Also he discusses the original Ghost Tag which did not use a gaffed key, but
a palmed source of power. Utilizing the latter (e.g., ) which you may
have around, or should, helps to grease the skids so to speak, and then you can return to the key
alone. I'm nur a semi-pro but I have no hesitation carrying this with me. Disclosure: bought on sale
off site.