Fiio S3 is a card reader speaker. It can play MP3 or WMA music which stored on a SD/MMC card. This speaker is powered by 2 AA batteries.

Dimension : 156 x 65 x 26mm
PC Interface : USB2.0 high speed Data Transfer
Memory : Up to 16GB

Audio
WMA(VBR) : 8-355kbps
MP3(VBR) :  8Kbps-320Kbps
Earphone Output : 220mV@16Ω
Earphone Output Frequency Band : 20Hz-20kHz
S/N Ratio : >80dB
Distortion Rate : <0.5%

Amplifier
Output Power : 1.2W + 1.2W
S/N :  >75dB A-weight
THD+N : <0.8%

Speaker
Frequency Band :  150Hz-20kHz
Impedance :  6 Ω
Power : AA battery X 2DC 5V 800mA

Accessories : USB Cable, 3.5mm to 3.5mm Audio Cable