MHD IP640 In-ear Heavy Bass Headphone With Microphone for Tablet Cellphone Features: Adjust volume and switch songs freely. Complete aluminum sound cavity. With high quality sound. Built-in microphone, volume control, next\/previous song switching. S.P.L. at 1kHz (dB) Distortion rate 1 (%) Speaker diameter 10 (Φmm) Weight:100g Specifications: General Specification Brand Name MHD Model Model IP640 Color Silver Cable Length 1.2m Wearing Type In-ear Technical Parameters Wired Control Yes Driver Unit 3.5mm Receive Sensitivity 116dB±2dB Impedance 32Ω Frequency Response 20-20kHz Package Included: 1 X MHD-IP640 Earphone