Input: 5V  Output:3.7V---- 1000mA
SPEAKER UNIT:2W*2
OUTPUT POWER:2W*2  4Ohms(1KHz 10% THD)
EREQUENCY RESPONSE:275Hz-20KHz     

Features:
1) Can be work for iphone/ipod MP3/4/Mobilephone 
2) compatible with SD/MMC card
3) Li-battery rechargeable function