Take open-ear listening to new depths. OpenSwim (formerly Xtrainerz) is engineered with Shokzs signature open-ear design and 7th generation bone conduction technology to ensure bud-free, comfortable listening all day, in or out of the water. OpenSwim is completely waterproof and submersible, and features four gigabytes of MP3 storage, enabling athletes to train harder; no wires, no devices, no limits.Key Features:Internal Music Storage OnlyNot Bluetooth Compatible  IP68 Waterproof  8-Hour Battery LifeComfortable Under Swim Cap Comfortable Under Swim CapDesigned For SwimmersEngineered to withstand all elements. OpenSwim is fully waterproof and submersible so you can swim, run, cycle, or train harder than ever before.Open-Ear ComfortOur open-ear design powered by bone conduction technology ensures bud-free, comfortable listening all day, in or out of the water.IP68 WaterproofOpenSwim has an IP68 waterproof rating and can be submerged in water up to two meters deep for up to two hours.4G