Wireless fidelity, or Wi-fi, is a radio frequency technology that allows laptop or handheld computer users to access the Web or corporate networks in the vicinity of a hot spot, or wireless local area network. Because Wi-fi adoption has grown over the past few years a simple device for tracking hot spots was needed. Kowloon-based Tsuen Shing Enterprises has released its portable WiFi Finder. The battery-powered device, measuring 66 x 45 x 8.8mm, detects the most available Wi-fi signal up to 60 metres away in open areas. It has a liquid crystal display that shows the strength of a signal, eliminating the need to boot up a notebook or handheld computer to find a hot spot. It also filters out other 2.4-gigahertz signals from cordless phones, mobile handsets and microwave ovens. The pocket WiFi Finder costs about $150. Visit www.tsuenshing.com.hk .