IPX5 waterproof and sweatproof : The R50i earbuds are IPX5 water waterproof and sweatproof, so you can use them even in wet or sweaty conditions. This makes them perfect for workouts or outdoor activities. AI-Enhanced Clear Calls : Be heard clearly thanks to soundcore R50i two built-in microphones with AI-enhanced voice pick-up. 30 hours of playtime : Get 10 hours of playtime on a single charge and stay powered for 30 hours in total with the case. 22 Preset EQs: Choose how you want to hear your music in the soundcore app. Big 10mm Drivers: The drivers produce powerful sound with punchy bass. Fast Charging: A fast 10-minute charge gives your earbuds an extra 2 hours of playtime. Single Earbud Mode: Leave one ear free to hear your surroundings while you listen to audio with the other. A solo earbud can play audio, while the other is in the case.