Brand new, unopened ALPEX Hi-Unit Fully Wireless Earphones BTW-A3700/Red [Product Overview] [Shape designed for "fit" in the ear] Equipped with the original ear fin parts "Fit Catch". The silicone material further enhances the fit to the ear. Designed to fit various ear canal shapes. [4 ear tip sizes] Includes 4 sizes: XS, S, M, and L. Allows for a wider range of people to fit the earphones. [Physical button specification] Click feel, operation with large buttons on the side of the earphones. Ideal for those who are not good at touch-type earphone operation or accidentally touch them. [Waterproof IPX4] Waterproof performance that can withstand sudden rain and splashes. Bluetooth Earphones Bluetooth Commuting to work or school Wireless Stereo