Use either of the IPX4 TWS wireless bluetooth earbuds one at a time for calls and music, or you can switch freely between twin mode and mono mode. It provides you with lossless sound quality, so you can get a clear call experience. IPX4 waterproof can easily resist sweat, which is very suitable for running, yoga, hiking, driving or other outdoor activities.The earbud fits easily into your ear, comfortably and safely. Features: Transmission distance:10-12m Single Battery Life: About 2.5H Charging Time: 1.5H Battery Capacity: 300mAh Type of Battery: LITHIUM Waterproof Level: IPX4 Price Includes: Free setup Free 1c1p silkscreen imprint Free virtual proof Free logo PMS matching Free standard shipping to 1 continental US commercial location