BYZ Digital Technology Co.,Ltd.is an early headphone manufacturer in China.he company has 3 factories,more than 1000 employees.The product capacity is more than 4 million sets monthly.Sales volume is more than 3 million sets monthly.w have 2 brands BYZ and Tongzhiyin OEM orders are welcomed as well.Products of the company include mobile phone hand free \ headset,MP3/MP4 headphones,universal headphones detector for China's copy mobile phone,universal USB charger etc.,about 10 series with ...