The following report compares gadgets using the SERCount Rating (base on the result count from the search engine). Note: due to some search engine quota, not all result is available yet.
Kensington Edge: WiFi Finder eliminates wasted time and effort booting up laptop or PDA to find hot spots.
Convenient one-button wifi detector searches and indicates signal strength if 802.11b or 802.11 b/g network is within range, with separate indicator for active Bluetooth enabled device or network
Finds wifi while filtering out other 2.4 Ghz signals from cordless phones, cell phones and microwave ovens
Compact wifi finder unit with built-in flashlight fits in hand and attaches easily to laptop carrying case or to keychain
5 LEDs display hotspot wifi network signal strength to correspond with most laptop signal strength meters