Instructions Drive unit: Ф15mm / 6u (true copper ring horn) Sensitivity: 110dB Frequency Response Range: 20Hz--20KHz Features 1. Lightning interface, headphones with automatic upgrade chip, don't have to worry about the iPhone version upgrade(Android & ios Universal); 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 Earphone PACKAGING: PLASTIC ONLY