5-8 hours of playing time and storage capacity of over 2,000 songs (8 GB). Download all your favorite music from your computer (support wav, ape, flac, m4a format). This device allows you to randomly play all the music in the memory. 100% Waterproof: The audio waterproof technology enables the earphones to withstand a lot of sweat, rinse after active use, and be immersed in the water for an unlimited period of 12'/3.6m. Waterproof rating: IPX8. FM RADIO: 87-108Mhz (directly press the FM button to enter the Radio function). Excellent sound: Designed for use in water. Our headphones are sound engineering designed to provide improved bass amplified sound. Guarantee: Our products use high-quality materials to make the product quality better