Canary Wireless hits another homer with latest Digital Hotspotter: About three and four years ago, the market became suddenly glutted with a variety of compact Wi-Fi detectors: relatively inexpensive devices designed to give you a snapshot of the radio frequency environment around you in the more common Wi-Fi band (2.4 gigahertz). Trouble is, most of them either worked poorly or provided too little information.

The original Digital Hotspotter and a combination detector/adapter from Zyxel were my two favorite devices for the amount of information they provided. A detector, to be useful, must show enough network information that it prevents you from having to open up a laptop; or enough information to help you find a stronger signal or troubleshoot what's wrong with a network.

The Digital Hotspotter (model HS-20, $59.95, on sale 15-Feb-08) really does shine, partly because it now includes support for detecting 802.11n networks, and reveals the network's top speed based on packets it's sniffing. The device has three buttons now instead of one, all along one side. The top button is the power button: hold it down to turn it on or turn it off; press it while it's on to rescan the environment. Previous and next buttons let you scan through the available networks. See this YouTube video I shot for a live demonstration.

The display now shows the network name, whether it's secured, its form of encryption, the type of 802.11 network (B, G, or N), the top speed based on it's network settings, and the channel on which it's operating. My only real complaint with the device is that it turns off its backlighting a little too quickly while I'm still trying to read the scrolling information about network speed and other parameters.

The price is a little high for the casual user, but a road warrior, network administrator, or those desiring to find open and free networks should find this a bargain.

(For the historical record, I reviewed the SmartID WFS-1 in 2004, a device with a single button and a few LEDs, which showed all 2.4 GHz activity; the Chrysalis WiFi Seeker, which looked just for 802.11b/g, showing activity with LEDs, in early 2004; the first Canary Wireless Digital Hotspotter, which had no back/forth buttons, but had an LCD to show network status, in late 2004; and Zyxel's combination USB Wi-Fi adapter and LCD display network detector in 2005.)