The item Large 10mm Drivers: The drivers have a punchy bass and a powerful sound. 22 Preset EQs: Use the Soundcore app to select how you want your music to sound. Ergonomic, Lightweight Fit: The tiny earbuds are comfortable for extended listening sessions and are lightweight. They are conveniently carried and stored in a small case with a lanyard. All-Day Playtime: With the case, you can play for 10 hours on a single charge and remain charged for a total of 30 hours. AI-Clear Calls: Your voice will be heard in pristine clarity thanks to two microphones and AI processing. Fast Charging: Your earbuds can play for an additional two hours after a quick 10-minute charge. The Soundcore R50i true wireless earbuds are IPX5 water-resistant, meaning they won't be damaged by water splashes.