Open-ear Comfort – Our Open-ear Design Powered By Bone Conduction Technology Ensures Comfortable Listening All Day Long, In Or Out Of The Water. Includes Shokz Nose Clip. (refurbished Version Of Aftershokz Xtrainerz) internal Music Storage – The Openswim Swim Mp3 Has Internal Music Storage For A Library Of Up To 1,200 Songs Ready To Play At The Touch Of A Button. Supports Mp3, Wav, Wma, Aac And Flac For Device-free Listening. (without Bluetooth) ip68 Waterproof Rating – The Openswim Mp3 Has An Ip68 Waterproof Rating And Can Be Submerged In Water Up To Two Meters Deep For Up To Two Hours. 8 Hours Of Music – With 8 Hours Of Battery Life And Easy Commands Like Play, Skip, Pause And Rewind, You Can Enjoy Your Music Turn After Turn. secure Fit - The Openswim Swim Mp3 Is Comfortable Under A Swim Cap Or Helmet And Weighs Just Over 28g For All-day Comfort.