Parameters for speaker:
1) Output power: RMS 4W (2W+2W), THD=10%
2) Frequency respond: 150-18,000Hz (± 3dB)
3) Signal to noise ratio: ?80dB
4) Power source input: DC 9V/1,000mA
5) Speaker size: 18 x 4.7 x 4.8cm

Functions:
1) Metal shell
2) Several ways to supply power for speaker:
a) 4 AAA batteries
b) USB power connect line,
c) AC/DC power adapter, DC9V/1,000mA (optional), and when you supply power for speaker
by the AC/DC adapter, also you are charging for the Mobile phone synchronously
3) Adjust volume by electron
4) Can link MP3, MP4, laptop, CD, Mobile phone and iPod Nano 
5) Compatible models:
a) SonyEricsson: W750, W800, W810, 500, 790
b) Nokia (optional)
6) Color: silver, purple

Inner packing: 
1) Color box dimensions: 25 x 14 x 6.5cm
2) Blister

Outer packing: 
1)Color box packing:
48pcs/ctn
Carton dimensions: 77 x 29.5 x 53.5cm
N.W.: 16kg
G.W.: 17kg

2) Blister packing: 
40pcs/ctn 
Carton dimensions: 75 x 26 x 33.5cm
N.W.: 9kg
G.W.: 10kg