bluetooth 5.1 and one step pairing : donerton wireless bluetooth headset is equipped with a new generation of bluetooth 5.1 chip, which can provide the most stable connection and clearest call. because of the existence of bluetooth 5.1, it can quickly connect with your mobile phone. when you put the mobile phone in your pocket, it will not be disconnected, and it is compatible with all mobile phones on the market. 40 hours ultra-long play time : wireless sport earphones can last for over 10 hours’ playtime from a single charge and 40 extra hours in the compact charging case. no more worries about battery life on the go. bluetooth earphones in ear are very suitable for outdoor sports, workouts whole day. ip7 waterproof: donerton wireless earphones provide ip7 waterproof function, so it can protect sports wireless earphones from water drop or sweat damage. But please note that in order to avoid unnecessary troubles, do not wear it when swimming, because the sound cannot be transmitted in the water, and after exercise, please wipe off the sweat of the earphones then put them in the charging case to charge. ergonomic earhook design : adjustable and secure-fit silicone ear hooks and ergonomic design ensure your sports earbuds stay comfortably firm in place when doing sports, running, hiking, jogging and other outside activity etc.equipped with 3 pairs of ear caps l m s for your choice to get the most suitable fitting.even if you do strenuous exercise, do not worry about the earbuds will fall off. individual led power display for earbuds and charging case : donerton sports bluetooth headphones charging case with led power display shows remaining power in percentage. charging case presents its battery from 1%-100%. For the right or left true wireless earbuds, there are separated power consumption indicators. 5 grids in total, each grid represents 20% power of bluetooth earbuds.