I hope this helps - Fred

For the price of one good chip ($19.99 at Amazon) you can buy the Chrysalis WiFi Seeker Finder. It fits on your key chain, and with press of a button locates WiFi networks around you.

Features:

Small, easy to use and just plain cool!
Works up to 300' away!
Directional. You can pinpoint the source!
Detects 802.11b and 802.11g
Will not detect cordless phones or microwaves

Product Description

This very compact unit attaches easily to your keychain. It will detect any wireless network (802.11b/g) up to 300' away. It has 4 LEDs displaying the signal strength. It can also be used to pinpoint the source of the network as it is directional. Simply hold down the button and point the seeker in a sweeping motion to find the source of the network signal. The LEDs change instantly as the signal strength changes as you move. This is simply the best WIFI detector on the market today. It is the most powerful detector available and packed into this little compact body makes it a "must have" gadget for any owner of a wireless-capable laptop.

Customer Review

WIFI Seeker exceeded my expectations, December 23, 2004
Reviewer: Bart Beasley (Colorado Springs, CO) - See all my reviews

When I first got a wireless network at home I purchased a Kensington WIFI Finder. It worked fine. But as time went on I saw these smaller versions come out from Chrysalis Development. I heard they were more powerful and more versatile. So I bought one. I was NOT disappointed. Since it was about the same size as my keyless entry remote for my car, it fit perfectly on my keychain. Also it has a much longer range than the others. But best of all, it is directional. Meaning I can simply turn my body while holding down the button and the LEDs change instantly as the signal strength increases or decreases. What a great product. I Love it!