Specifications: 1) Power supply: DC 6.0V (4 x "AAA" batteries) 2) AC Adapter: out put 6V, 800MA 3) Output power: 0.9 + 0.9W 4) Frequency response: 200Hz - 12kHz 5) Speaker: 50mm speaker, 4ohms 6) Signal cable: 22cm str, cord 7) Plug: stereo 3.5mm gold-plated l type Inner packing: 1pcs/blister packing Outer packing: 20pcs/ctn