True After-sales Service - If you have any questions during use, please contact the LOBKIN service team in time to solve the problem in time and provide you with a 18-month warranty service. True Battery Life - The charging box has a built-in 300mAh battery capacity. A single LOBKIN ultra-mini micro earphone can be used continuously for up to 4h to listen to music or make calls. With the charging box, it can be used for about 20h. True No Sensation - Are your ears painful due to the pressure from the headphones when you sleep with them on? The size and weight of LOBKIN1 sleep earphones are smaller than a coin, and you won’t feel their existence even if you sleep on your side while listening to music. True Bluetooth 5.3+EDR - Is the sound intermittent due to low Bluetooth level? LOBKIN uses Bluetooth EDR technology, which not only achieves more stable audio streaming and lower power consumption, but also greatly improves the data transmission rate of Bluetooth technology. True Noise Blocking - Are you often disturbed by noise and unable to sleep before bedtime? LOBKIN Sleep Earbud is made of new soft material, which can completely plug the ears, isolate external noise, and keep away the noise of snoring and kids. IPX6 waterproof.