Bluedio F3 Touch Control Bluetooth Handsfree Earphone Stereo Bluetooth V4.1 In-Ear Headphone with Mic for Tablet PC Smartphones. Smart-phone apps are becoming the north star for millions of people who use them to navigate through life - shopping, playing, reading, dating, learning, and more with their fingertips. Now, the Bluedio F3 APP comes around! You can control pairing, adjust EQ via this F3 APP and do more by simple touch and click. Buy this product and Get Free Shipping + Save 26% OFF for the Bluedio F3 Touch Control Stereo Bluetooth In-Ear Headphone with Mic Support Tablet PC and Smartphones.