1. HIFI Earphone, portable and comfortable to wear. 2. 3D surround sound effect and high-quality super bass design. 3. Wide dynamic range;Dual bass sound unit design, a broader range; 4. Excellent bass response;Connect to all MP3 players and digital audio device; 5. Smart wire control, built-in microphone, clear call quality, song switch for music play. Specifications: General Specification Brand Fonge Model F4 Color Black, White, Blue, Purple Wearing Type In-ear Cable Length (m) 1.2m Technical Parameters Microphone Yes Wired Control Support Plug Type Straight Rated Power 5mW Receive Sensitivity 96dB Impedance 8 Frequency Response 20-20kHz Package Included: PACKAGE CONTENT 1* [Dual Dynamic Drivers] Fonge F4 Heavy Bass Earphone 2 pairs of eartips