High quality Earphone For smart phones. Standard 3.5mm earphone plug fits all MP3 players with 3.5mm jack. With the function of answer phone, listen to music for all XiaoMi phones. b Compatible With all smart phones with standard 3.5mm jack. High quality, deep bass sound and nice package, excellent for retail. Noise Cancelling, good for listening RAP&music. Technical Specification 1.Cord length: 1.2m 2.Plug:3.5mm,4pin, stereo 3.OPPO Original Inner Earphone