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TeleZapper TZ 900

2.7 out of 5 stars 263 customer reviews
| 19 answered questions

List Price: $39.99
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  • Helps automatically remove your phone number from telemarketing lists
  • Covers all phones and answering machines on the same line
  • Doesn't interfere with normal calls and telephone functions
  • Advanced 3-tone operation tells predictive dialing computers your number is disconnected
  • Built-in battery, no AC adapter required
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Product Description

Product Description

Not only does this handy gadget screen telemarketing calls for you, it also helps to ensure they won't keep trying to get ahold of you. The TeleZapper from Privacy Technologies plugs into any phone or phone jack. It works by emitting a special tone that makes your number appear disconnected to computer-generated calls. Eventually, as your number is eliminated from lists, the calls become a rarity, rather than routine. It won't interfere with manually dialed calls, answering machines, voicemail, Caller ID or Call Waiting. However, it may remove your number from the lists of organizations that use dialer computers. Easy installation. No monthly fees or service charges. AC adapter and phone cord included. Charcoal gray. No. TZ 900. Imported. 3Hx7Wx5D".

When you've had your dinner interrupted by a telemarketer one too many times, treat your phone line and yourself to the Telezapper TZ 900. It's a simple, one-time-cost solution to the problem of annoying telemarketing calls. Based on the enormously popular classic Telezapper, the newer Telezapper TZ 900 offers the advantages of a slimmer profile, built-in battery power, and an advanced three-tone mode.

Here's how it works: Given that more than 90 percent of telemarketing calls are placed with computer assistance, when either you or your answering machine answers the phone, the Telezapper emits a special tone that tells the computer your number has been permanently disconnected. Telemarketing companies that use automated dialing systems typically remove disconnected numbers from their calling lists, and as your phone number is eliminated from more and more telemarketing lists, you'll notice fewer calls. Of course, not all telemarketers use predictive dialing systems, and those that do will undoubtedly continue their work to evade the Telezapper, but it can be a partial solution.

Most predictive dialing systems will be fooled by the Telezapper's standard single tone. However, for newer dialing systems (presumably designed in response to the success of the previous Telezapper model), the TZ 900 offers an advance three-tone mode. To change the mode, unscrew and remove the protective case and then slide a recessed switch. (We suggest that Privacy Technologies put the switch on the outside for their next model.)

For the most part, regular callers are unaffected by the Telezapper, but it may "zap" calls from other organizations that use the same predictive dialing technology (such as charities, pollsters, and automated emergency weather systems) and from callers who use certain types of calling cards. (For more information, click FAQ, or frequently asked questions, in the left navigation bar.)

Installation takes seconds. Just plug the Telezapper into your phone line and your phone into the Telezapper. It's that simple. A built-in lithium-ion battery provides power and will likely last for the lifetime of the unit. The Telezapper includes a phone cord and instructions. Privacy Technologies backs the device with a one-year warranty. --Mike Brown


  • Reduces telemarketing calls placed by predictive dialing systems
  • Doesn't interfere with most normal calls
  • Inexpensive, one-time-cost solution
  • Extremely easy to install and use
  • May "zap" some desired calls
  • Annoying beep every time the receiver is lifted

Product Information

Product Dimensions 9.2 x 8.4 x 2.7 inches
Item Weight 12.8 ounces
Shipping Weight 12.8 ounces (View shipping rates and policies)
Domestic Shipping Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
International Shipping This item is not eligible for international shipping. Learn More
ASIN B00006881R
Item model number TZ-900
Customer Reviews
2.7 out of 5 stars 263 customer reviews

2.7 out of 5 stars
Best Sellers Rank #7,435 in Electronics > Office Electronics
Discontinued by manufacturer Yes
Date first available at May 12, 2004


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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By IlPrimitivo VINE VOICE on February 18, 2003
I used to get marketing calls almost every day with calls in the months leading up to the holidays hitting my phone both in the morning and evening.
Finally I had enough of the marketing call hassle and decided to fight back. I put a TelezZapper on my Christmas "wish list" and received one as a gift. I was a little skeptical about the thing and wasn't really sure if it would work but a few days after getting the unit the TeleZapper was on my phone line and I was waiting for the first telemarketer call to arrive to get zapped. I was also waiting to see if it would zap my DSL connection since it's on the same phone line.
I didn't have to wait very long. The phone rang, I picked up the receiver, and in about a second I heard the tri-tone signal, and then said "hello" ... the line was silent. I called out again and got no response. I just zapped my first telemarketer and it was great!
I booted up my computer to test my DSL line and it didn't skip a beat. I also checked my caller ID and it still registered numbers.
Finally, something that actually seems to work!
A few things to note:
· Re-record your message machine to allow a 2-3 second gap at the beginning so that the Telezapper can beep and not garble the beginning of your message.
· Tell your friends about the device on your phone and tell them not to hang up when they hear the tones. Some of my friends just thought they got a wrong number and hung up to try again.
· If you're not expecting any calls you may want the call to go to your answering machine first to get zapped and then pick up after you're sure there's a voice at the other end of the line.
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I always enjoy reading reviews of "controversial" items. It amazes me what expectations people have in a product. This item is a great example. Here's how this item works:
Telemarketers and others use computers to call up people to try to sell them stuff. They can literally dial THOUSANDS of numbers a day. It doesn't matter if your number is unlisted. If it can be generated by a computer, you will get unsolicited calls. Caller ID is great to avoid unwanted calls BUT unfortunately, just because you don't answer, doesn't mean they'll stop calling your number. The phone company offers a "blocking" service, but you pay every month and sometimes every call coming into your number. There is a national and state by state "NO CALL" list you can sign up to on the net. But, I'm signed up with several, I still received DOZENS of calls selling stuff.
For various reasons, the Phone company's computer has an electronic signal to mark disconnected phone numbers to other computerized systems.
The Telezapper TZ900 mimicks these electronic "disconnected" signals. That fools the telemarketers' (and others) computers into believing the number is disconnected and hangs it up. The telemarketers system is set up to delete "disconnected" numbers, so it doesn't waste "valuable" telemarkerters time.
If you have Telezapper connected correctly (pretty easy with instructions), your phone number will eventually show up as disconnected to all the telemarketers! The telemarketers will EVENTUALLY stop calling.
There are NUMEROUS telemarketers with NUMEROUS computerized calling systems, but EVENTUALLY your phone number will be on less and less lists! Thus less & less calls.
It won't be immediately. I noticed a difference after a week.
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I actually have the earlier model of the TeleZapper -- the one that's the size of a small answering machine. The product does exactly what it is designed to actually do, and it does so reliably. But the real question is does what the product actually do stand up to it's marketing as a way to stop telemarketers from calling you.
The answer is, to some degree, sort-of.
The way it works is this: The telemarketer calls you. You (or your answering machine) answers the call, and the TeleZapper beeps. If the telemarketer is using the right equipment to recognize that tone as being a non-working number, the telemarketer will automatically disconnect from the call, and theoretically delete your phone number from the list it is using.
So let's look at this closer. Your phone still rings. If you (or your answering machine) does not answer the ringing phone, the beep-tone is never heard by the telemarketer's equipment. The result of not answering the phone is the same with or without the TeleZapper.
Okay, so we have to answer the phone once. But after that one time aren't we deleted from the lists they all use? Well, no. There are lots of lists out there. Some are used only once. Doesn't do much good to be removed from a list that will never be used again. But in all fairness, you will be removed from a few lists that might have gotten used again.
My personal experience was that initially there was no change in the number of calls. It took some time before any of those beeps my TeleZapper made had any effect on whether or not I was going to get called again. During this first period, I still got to talk to a lot of telemarketers because they weren't using equipment that the TeleZapper had any effect upon.
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