The Java ME Platform SDK emulator simulates a MIDP device on your desktop computer. The emulator does not represent a specific device, but it provides correct implementations of its supported APIs. The SDK uses the device manager to detect devices and displays the available devices in the Device Selector window. See Running the Device Manager.
The Java ME Platform SDK provides default devices with Sun skins. A skin is a thin layer on top of the emulator implementation that defines the appearance, screen characteristics, and input controls.
If the Device Selector window is not visible, select Window > Device Selector.