Features: Superior sound quality.Onboards 2W amplifier(5V power of up to 3W) is directly connecting to the speaker(recommendation 43W speakers),3.5mm gold plate headphone port can connect with headphones or external audios. Support MP3 format, playing power automatically.When mp3 is play the red LED flashes. Support disk (test 32G), Memory Card (test 16G) play modes; power defaults Memory card modes, if the card do not exist automatically jump to the disk modes,and both devices have installed,then you can manually set the play modes.For detail please see the key operating instructions. Button can be adjusted up and down to control songs,volumes up and down, pause or play, modes switching.For detail please see the key operating instructions. Press menu button enter the single/all song play modes.The defaults modes is the all song modes when power.Pressing the Repeat button can replace the circulating modes. Specifications: Component:Plastic Size:Approx.45.6x35.2mm/1.8x1.39inch Option Type:1pc MP3 Decoders Module,2pcs MP3 Decoders Module; Power ranges:3.7~5.5V Package Includes: Package A 1pc MP3 Decoders Module Package B 2pcs MP3 Decoders Module note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.