I bought one in 97... They say you need at least two people, preferablly a male/female. I never contacted anyone, nor did the glass indicator move to letters.. But something weird did happen.. Could be a total coincidence, but one day after using it, every place I went a light went out.. A light went out at my house.. A light went out at the DR's office... A light went out at my friends house.. All burned out bulbs?? Shook me a bit.