Title: Works as advertised. But watch out for dead battery.
Review: I installed the Telezapper TZ 900 about 2 weeks ago, and the telemarketer calls have pretty much ceased. I used to get 4-5 calls every evening. Now, I might get one every 3 days, and I don't think it is a computer generated call. I have the Telezapper set to advanced mode (3 tone disconnect signal). The reason I gave the unit 4 stars is because the unit was delivered with a dead battery. Please be aware of this. When it is connected to your phone line, you should hear the disconnect tone when you pick up your phone. If you don't hear the tone, then the battery is dead. The battery was easily available at my local Longs drugstore. I suspect that many of the reviewers who claim that the device flat-out doesn't work had units shipped with dead batteries.
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