Designed for use with desktops, notebooks, and iOS/Android mobile devices, the Pebble Plus 2.1-Channel Desktop Speakers from Creative features dual 2" mid-range and far-field drivers, which are angled at 45° for improved sound delivery, and a down-firing subwoofer for bass frequencies with greater clarity and depth. The Pebble Plus connects to your host system's audio jack using an an integrated 3.5mm cable, and an integrated USB Type-A cable provides power using the USB bus. Subwoofer connectivity is achieved using an integrated RCA cable, and other devices, such as iOS and Android devices, may also be connected using the 3.5mm cable. If you need increased sound output, a High Gain Mode switch delivers an output of up to 8W RMS. For added convenience, the volume controls are located on the front of the main speaker. As a whole, the Pebble Plus has a frequency response of 50 Hz to 20 kHz and a signal to noise ratio ≥75 dB.