FirstSing FS27014 Mic Speaker for iPhone 3G S/iPhone 3G/iPhone/iPod
Use the date port for iPod to play music,to fit iPod without built-in speaker
Advantage: Small size,no require batteries.
Disadvantage: Voice is a little lower.

Specification:
*VDD=3.3Vmax
*Pout=105mWmax stereo
*THD+N=0.3% Po=50mW RL=32R f=20HZ to 2KHZ
*DIGITAL VOLUME STEP=16step

Housing:62*21*15mm