Wide Compatibility: The wired earphone works with smart phones, tablets, MP3/MP4 players, kindle/kindle paperwhite and any other devices with 3.5 mm jack. FCC/CE/ROHS certificated. High Sound Quality: Deliver clear crispy sound and correct intermediate frequency. Ensures superior audio performance in music playing by the advanced Noise Isolation technology. Extension Cord: Comes with 3.5mm male to female stereo audio cable(1m long). Extends the connection between AGPTEK waterproof ear buds and your music devices. Coiled Earphone Cords: Convenient use without any tangle(16-35cm extended length). There sizes(S/M/L) of eartips for swimming and two for general use give you a good fit and more choices. IPX8 Waterproof: High-level water-resistant makes it suitable for sports such as bathing, surfing, running, skiing. The inner nano-coating makes it possible to immerse in water of 1.5 meters deep for 30 minutes without affecting the performance.