iwish New Arrive KZ-ZS1 Dual Driver Super Bass Noise Cancelling 3.5 mm Sport In-Ear Monitors Earphone Headphones Without Microphone for Phone iPod MP3 Professional double unit Professional divider circuit Ergonomic design 108 strands core lossless transmission Resin molding: External cavity headset uses a resin material,reducing weight,but also increases the permeability of the sound!