1,mini audio 2, high quality and service 3, ... power supply3.5mm mp3 earphonemini audio,nini speaker for computer ,pc fast delivery,environmentally friendly,meet ROHs ... standard,advantaged price and high quality for mass purchaseWe are a leading manufacturer ofearphone products. ... Supervisory Control: Test Machines:Fashionable design colorful mini speaker show: Famous partners we work with: