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Public wireless hot spots are cropping up all over the place. But how do you know if youre in range without booting up your laptop and searching for a signal? Try the pocket-size Kensington WiFi Finder. Just press a button and the device instantly lets you know if your location is wired for 802.11b or 802.11g. Three LEDs indicate signal strength, and the device is smart enough to filter out other wireless signals, including those of cordless phones and Bluetooth networks.