4D Systems SOMO-II (Sound Module 2) is a tiny Audio-Sound module that can play MP3 audio files stored on a micro-SD card (or USB 2.0 Flash drive with extra components), such as voice and music. The SOMO-II features an on board 16bit MCU, specifically designed for hardware audio decoding. The SOMO-II supports both FAT16 and FAT32 formatted micro-SD and USB Flash Drives up to 32Gb in size, and features a 24-bit DAC output with support for all MP3 bit rates (11172-3 & ISO13813-3 3 Layer Audio Decoding) with 8-Khz to 48Khz Sampling Rate. The compact 16pin drop-in-module takes up very minimal board space and is ideal for any application that requires embedded audio. The SOMO-II features an on board mono Amplifier capable of driving an 4ohm 3 Watt speaker directly (see Section 4.4). It also features stereo DAC output for connecting directly to headphones or into an external amplifier. With only 2 push buttons, a 3.3V to 5V battery and a speaker, an extremely compact and low component count MP3-Player like system can be implemented. In short, 4D Systems SOMO-II offers a very flexible, compact and low cost embedded audio solution for many applications.