This is the special version of KZ-ED2 in ear earphone. Different from KZ-ED2 standard version, this earphone is built-in microphone, allowing you to listen to music and answer a hands-free call at any time. Built-in Microphone Enables hands-free phone calls and lets you easily switch between songs and incoming calls. Deep Bass The bass is clear and precise with a lot of enjoyable and deep sub-bass, clear and powerful bass sound effect. 7mm Magnetic Pronunciation Unit KZ-ED2 adopts double magnetic pronunciation unit 7mm and its frequency response reaches up to 6-31000 HZ. Noise-Cancellation Technology The sonic filter can avoid the noise and provide the best sound quality. 3.5mm Earphone Jack Supports MP3/MP4, smartphones, tablets, PC etc devices with 3.5mm jack. Specifications Brand KZ Model ED2 Style In-Ear Microphone Yes Connectors 3.5mm Function Noise Cancelling Communication Wired Cable length 1.2m±5cm Impedance 18 ohms Frequency Response Range 6-31000HZ Package Weight 40g Package Size (L x W x H) 140 x 100 x 50 mm Package Contents 1 x KZ-ED2 In Ear Earphone with Microphone