HEADSET MACARON U19 Drive Unit : 15mm / 6u (true copper ring horn) Sensitivity : 110dB Frequency Response Range : 20Hz--20KHz Product Features : 1. Lightning interface, headphones with automatic upgrade chip, don't have to worry about the iPhone version upgrade; 2. Functions such as up and down song selection, volume control, pause and call can be realized. 3. Imported chips, lossless digital sound quality; 4. Ultra-thin diaphragm copper ring horn, bass effect Package Includes: 1 x HEADSET MACARON U19