OS X’s System Profiler application is helpful if you want to see what is connected to your Mac at a given moment—but maybe you want to know when devices have connected or disconnected successfully. Peripheral Vision 1.6.3 monitors FireWire, USB, Bluetooth, and network connections, and notifies you when a new device is connected and when a connected device is no longer available. It’s a helpful tool for diagnosing problems. You can set up different notifications—visual or audio—for each type of device, as well as for connections and disconnections. And if you find the official name of a device to be uninformative—for example, Jargy USB—you can change how it appears when it’s detected (to, say, 4-Port USB Hub).