... 3> 3.5 mm plug 4> USB 5V input mini speakersUse to laptop/computer/mobile phone/Mp3,4 Welcome to enquiry!!! Specification1. Rated ... : >50dB5. SNR: > 60dB6. Audio source: MP3,MP4,CD,DVD,iPod,iPhone,GPS,PSP,mobile phone,laptop etc..7. Audio input: 3.5mm ... .: 0.39kg3.QTY: 66pcs/CTN Product Picture: Cheaper 2.0 mini laptop speakers , Square 2.0 computer speaker , USB power support