Brief Introduction:
This is a high-quality dual-channel class-D audio amplifier board capable of delivering 2W per channel of output power into a 4Ω load. It employs PAM’s PAM8803 IC which offers 64-step digital volume control and low THD+N, allowing it to produce high-quality sound reproduction. It’s especially suitable for small speakers. This amplifier board can also be used to drive passive 4Ω or 8Ω speakers.   
Three kinds of unique design make this product a perfect "Class D" architecture: (1) This board can be either powered by wide DC voltage (DC4.5V to12V) via a power port or powered by 2 to 3AA batteries or DC2.5V to 4.0V via a terminal block. (2) Audio signal can be input via 2510 connector or 3.5mm headphone jack. (3) Volume control is available via on-board buttons or an external rotary encoder daughter board.

Features:
    - Size: 74.40 (L) × 54.80 (W) × 18.00 (H)  ±0.2mm
    - A perfect "Class D" architecture
    - Miniature and high quality
    - Full-bridged stereo output
    - 64-step gain adjustment
    - Frequency response: 20Hz to20KHz(±3dB)
    - Signal/Noise Ratio: 85dB (f=22 to 22KHz, THD=1%)
    - High Output Power
      - 1.2W @ 8Ω, < 10.0% THD+N
      - 2.0W @ 4Ω, < 10.0% THD+N
    - High Efficiency
      - 85% @ 1.2W 8Ω
      - 88% @ 2.0W 4Ω
    - Audiophile Quality Sound
      - 0.19% THD+N @ 0.5W 8Ω
      - 0.17% THD+N @ 1.0W 4Ω
    - Mounting holes facilitate installation and fixing
    - Several wiring methods facilitate connection
    - Excellent heat dissipation eliminates the requirement of an extra heat sink
    - Over/under voltage turn off
    - Over current protection
    - Over temperature protection

Specifications:

Applications
    - Home Active Speaker
    - Home Theater Receiver
    - Multi-channel Distribution
    - Active DVD System
    - Mini/micro Systems

Package Contents:
    - 2*2W @4Ω PAM8803 Class-D Audio Amplifier Full-featured Board ×1
    - 3.5mm to 3.5mm FM audio cable ×1
    - Power cord × 1