Vktech Wireless SD TF Card Stereo Headset Music Headphone for MP3/4 PC CD 3 Colors (Black) For mobile phone, PC, iPad, TV, CD, DVD, MP3/MP4 ect Volume can control if you insert SD/TF card. Volume can't control if you connect it with PC or other device. Wired Headset: Connect this item to your audio devices (such as computer, mobile phone, MP3, etc.) with 3.5mm audio output Wireless Headphone: can directly read MP3 music files from SD/TF cards Volume can control if you insert SD/TF card. Volume can't control if you connect it with PC or other device