USB 2.0 ConnectorsFor quick connections, Dell recommends using the front USB connectors for USB devices such as digital cameras, gaming controllers, and scanners. Use theback-panel USB connectors for USB devices that are seldom disconnected, such as USB mouse and keyboard devices.Headphone ConnectorUse the headphone connector to attach headphones and most speakers for listening to all sounds from your computer, including your CD player and computersounds such as beeps.Service TagThis label lists your computer's service tag and your Express Service Code (if applicable). If you call Dell technical support, use your Express Service Code toroute the call directly to the correct support personnel. The Dell technical support staff will ask for your service tag information.Back ViewPower ConnectorPlug one end of your computer power cable into the power connector, and plug the other end into an electrical outlet.Voltage Selection SwitchThe voltage selection switch must be set to match the AC power available at your location. The switch should be set for 115 V in most of North and SouthAmerica and some Far Eastern countries such as Japan, South Korea, and Taiwan. For most of Europe, the Middle East, and the Far East, the switch should beNOTICE: This computer supports the use of a USB hub. However, do not connect two or more USB hubs to a USB connector. Doing so may cause thecomputer to unexpectedly reboot.HINT: If you attach a USB device that was not included in your original computer order, you may need to install a specific driver to make the devicework. Check the documentation that came with the device or contact the USB device manufacturer for more information.HINT: Express Service may not be available in some countries.