Mobile phone Speakers With special particular patent in worldwide - expansile resonator construction ... Input: L/R280mV Power output: 1.7W x 2 S/N: 80dB AMP frequency range: 280Hz - 16kHz Charge voltage: 5V+0 ... : 0 - 40°C Applicable for MP3, MP4, laptop, PC, MD, mobile phone, and more, all kinds of digital player devices With the ...