Features:
1.Three power supply way: 1)battery(AAA1.5Vx4pcs); 2)DC5V
   (USB cable for PC); 3)AC adapter(6V/600mA)
2.Built in Dia.3.5mm stereo audio plug with 20cm length cable.
3.Volume adjustable (VR)
4.Compatible with MP3, MP4,mobile phone,computer,iPod
   and any other audio player with Dia.3.5mm audio jack.

Specifications:
1.Audio output: 2.0 double channels 
2.Speakers size: Dia.50 x 2
3.Output resistance: 2W/4ohm x 2
4.Output power: 4W
5.Sensibility: >75dB
6.Frequency response:  200Hz-18kHz
7.Dimension: 215 x 80 x 45 mm (extended)
8.Weight: 210g

Inner packing:
gift box

Outer packing:
Carton size: 52 x 38 x 27.5 cm
Incasement: 54 pcs/carton
N.W.: 9.43kg
G.W.: 12.17kg