Dell XPS 13 (9333, Late 2013) - Manual (Page 12)

Specifications
Views
System
Information
Memory
Ports and
Connectors
Dimensions and
Weight
Computer
Environment
Storage
Touchpad Power Adapter Camera
Communications
Battery
Video Audio
Display Keyboard
Audio
Controller Realtek ALC3661
Speakers Two
Speaker output:
Average 1 watt
Peak 1.5 watt
Microphone Digital array‑microphones in camera assembly
Volume controls Program menus and keyboard shortcut keys