Output power: RMS 3W x 2
Frequency response: 100Hz - 18KHz
Speaker specification: 5 "x2/4 Ω
Signal-to-nosie ration: ≥ 80dB
Dimension: 165mm*62mm*31mm
Power supply: DC 5V
Battery capacity: 3.7 V 1000mA
Material: Plastic box
Built-in: SD card, USB, decoding, FM radio, Aux
With built-in rechargeable Li-ion battery

Can be replaced BL - 5C of Nokia S battery, super strong power. Can work with any media devices with a 3.5mm audio plug, and can work with MP3/MP4, Music Mobile, iPod, and some digital products. With LED indicator light