1. This is special designed for IPOD.2. It is suitable for Ipod , MP3 and MP43. Output power : 2x2.5W4. Frequency : 100Hz - 12kHz5. Input sensitive : 500mV - 1.5V6. Power : AC 220V/DC 9V(50Hz - 60hZ) or 1.5V 4x3A battery7. Impendence: 4 ohm