Power Supply Options Compatible with multiple power sources for maximum flexibility. Use a standard Micro USB Android cable with a 5V regulated supply for direct connection. Supports either 5V power input (connect to 5V and GND) or 3.7V lithium battery input (connect to VBAT and GND). Maximum operating current is 5V 2A, ensuring stable performance. For audio clarity, a regulated 5V 2A power supply is recommended. USB Sound Card Functionality Builtin USB sound card with plugandplay capability. No drivers required — simply connect via USB and start using immediately. Enables direct music playback from your computer through the amplifier output. Audio Output Specifications Outputs stereo left and right audio signals for balanced sound quality. Compatible with two speakers with 2–8 ohm impedance and 3–5W power, or 4 ohm speakers at 5W. Designed for clear and powerful sound performance, ideal for small to medium audio setups. Practical Applications Connect to a computer for quality desktop audio in home or office use. Integrate into DIY speaker projects for portable sound systems powered by a lithium battery. Use in embedded projects or small entertainment setups where space is limited but sound quality is important. Key Benefits Flexible power input options: choose between USB, regulated 5V supply, or lithium battery for different use environments. Simple setup with plugandplay USB sound card for quick integration. Clear stereo audio output suitable for multiple speaker configurations. Reliable performance with stable current capacity for consistent sound quality.