Jayfi JA40 Stereo Metal In Ear Headphones Bass Noise Isolating Earbuds Earphones with Mic Aviation Aluminum Red Deep bass, soaring highs and clear midrange. Self-developed magnetic 9mm dynamic unit, with lighter copper and aluminum to cover the voice coil,let diaphragm get more powerful bass at the same power. Solid metal housing creates an undisturbed listening experience.JA40 chamber is made of Aviation Aluminum alloy precision machining,the craftsmanship to create luxurious texture. Handmade headset. Jayfi engineer building High-quality sound wth manual tuning. Remote control.compatible System: ANDROID Windows Phone iOSChrome plated plug, let the plug to be more durable. 1 year warranty.