Metal aluminum alloy cavity precision casting, high reduction without distortion, 15mm large moving coil composite film speaker unit, accurate analysis of each tone. Features: - It's Spiral ABS twisted wire, fully upgraded, without fear of bending and pulling - Three-hole 6D sound effect, immediately present HIFI high sound quality sense - Microphone integrated remote control, convenient and simple, free to switch between call music - Tilt into the ear design, long time does not hurt - High-quality gold-plated plug, compatible with 3.5mm round hole. Specification: - Speaker: 15mm - Frequency range: 20Hz-20KHz - Rated input: 3mw - Instant maximum force: 5mw - AC impedance: 32 15% - Wire length (total length ): 1230 30mm - Sensitivity: 97 3dB (at 1KHZ 1mw) - Material: aluminium alloy + ABS + TPE stranded wire What's in the box 1x JoyRoom Metal Flat Wired Earphones JR-E208 1x User Manual