Similar WiFi finders are on the market—allowing you to quickly see whether there is an open hotspot without pulling out your laptop—but very few allow you to also scan for Bluetooth networks.
The Wi-Fi Finder has a range of 50 meters and includes a lanyard to attach to your keychain. What's also interesting about this device is that you can switch scanning frequencies to one used by wireless cameras. A quick and easy way to see if anyone's recording you in the shower.
Available now for $37.