... I9 Self-singing Mini Karaoke Player for Laptop Mobile phone mp3 mp4 Product Description: Practice and improve ... time, take it out, plug it into your mobile phone, MP3 player, or computer and start singing away ... 3.5mm Buttons: Power Switches: volume, reverb, l/r/loop Dimensions: 74 x 26 x 15mm Package ... using the audio playback device (such as computers, mobile phones, MP3, MP4, MP5) into the required ...