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That little USB driven buzzer can make sound and light, a convenient way to get your user's attention. You can add Ethernet, Wireless or GSM connectivity to this device.
That device is a little USB buzzer. Both the frequency an volume can be controlled. There is even a way to preset simple beeping patterns.
In addition, the Yocto-Buzzer also features two bright leds (one red + one green) and two analog inputs able to read any resistive sensor such as switches, push buttons, potentiometer, reed contact, photo diodes etc....
Long story short, le Yocto-Buzzer is the device you need to get your user's attention, especially if your project is driven by a headless computer.
This device can be connected directly to an Ethernet network using a YoctoHub-Ethernet, to a WiFi network using a YoctoHub-Wireless-g, it can even be connected to a GSM network thanks to the YoctoHub-GSM.
USB cables and enclosure to be ordered separately.