... (Use with MP3, MP4, CD, DVD, Ipod, mobile phone, laptop, GPS, PSP) Specifications:Out put: RMS 6W(3W + 3W ... of Power amplifier: ≥80dB Loud speaker: 1.77inch(external diameter 45mm) magnetic resistant 4 Ohms Power supply: 5V ... of power amplifier: =80dB Loud speaker: 1.77" (external diameter 45mm). Magnetic resistant 4Ohms Power supply: 5V/1000mA ... MP3, MP4, CD, DVD, Ipod, mobile phone, laptop, GPS, PSP)