♚【LED Power Display and 30H Playback】Dual digital LED power display outside of the case is to show the power level for charging case and earbuds. When charging for the case, the LED light will start to flash from 1 to 100. When you put earbuds into the case, then earbuds will start to be charged. Fully charged charging case can provide 4-5 times full charging for both earbuds, each earbud can last 4-5H on single charging. So, you can enjoy 30H music time in total via using in turn. ♚【ANC+ENC Double noise reduction】Active Noise Cancellation ( Hybrid 3 layer Active Noise Cancellation ) : 1. Outward-facing microphone detects external sounds and counter with equal anti-noise to reduce the environmental noise up to more than 30dB. 2. Inward-facing microphone listens inside ear canal to pick up internal sounds and produce anti-noise again to twice cancel the left noise. 3. Ear caps prevent 90% noise going to ear canal. Environmental Noise Cancellation:Smart call noise reduction. ♚【Transparency Mode + Low latency effect】 You can hear what you want to hear, which lets outside sound in so you can hear and interact with the world around you. You can clearly hear the announcement of the airline or subway and what is saying around you without taking off the headphones. Touch the touch area of the headset 5 times to turn on the low-latency mode and enjoy the ultimate audio and video synchronization. (The earphone touch and click will have a smart prompt sound "di") ♚【HD Stereo Audio and Touch Control】Our working out earbuds adopt 10mm speaker which can perform bass, midrange and treble. You will hear clear HD stereo sound with punchy bass. It is easy to control music and phone calls through multifunction button of each earphone. Very convenient for play/pause music, track previous or next songs, activate voice assistance, answer, end or reject calls, toggle/close ANC mode/transparency mode. ♚【Ergonomic Design and Lightweight】M48 headphones' structure is the study of thousands of people's ear canal before design. Comes with three different sizes of ear tips, our M48 are fit for most people's ear cannals. These wireless bluetooth headphones are small and light, it’s convenient to carry. The sound chamber creates an airtight space with your ear canal that isolated from outside ambient noise and makes earbuds to deliver stereo sound which are perfect for sports, sleep, music, etc.