single side earphone & unilateral headset suppliers-shengna electronics factory are specialize in manufacturing high, middle and low end earphones with good management and strong technology, our advanced equipment, great variety of goods and outstanding quality ensured our product to be in the top position of this industry. for more details about mp3 earphone, please log on the website below.(www.sonna-elec.com) phone: (0754-7618006?13539673721),contact: mr. li