INVISIBLE DESIGN AND ERGONOMIC - Invisible earplugs are designed according to the shape of the ear, very small design style, very lightweight, fit securely into the ear hook, suitable for long-term wear and do not cause discomfort to the ear. Double Noise Cancellation -- Excellent physical noise cancellation combined with acoustic noise cancellation technology, you can enjoy a quiet sleep time with the sleep earbuds. Bluetooth 5.3 & Fast Connection -- High quality invisible Bluetooth chipset earphones provide a fast and stable connection, stronger signal and faster connection speed compatible with almost all Bluetooth-enabled devices up to 50 feet away. The connection is quick and easy and you can enter the music world in 2 seconds. PREMIUM SOUND QUALITY: These sleep earphones offer you high quality audio enjoyment. Whale Cavity stereo surround sound effect, immersive music enjoyment. Hidden Bluetooth earbuds are your perfect sleeping companion. Designed for sleeping: very small and invisible ear plugs body design. If you like to sleep with ear plugs and don't like the foreign body feeling in your ears while sleeping on your side, then these sleep earplugs are the best for you. Sleep on your side without squeezing your ears, and the U-shaped skin-friendly rubber ear caps ensure that the headphones sit on your ears all night long. Material: Plastic. Earphone battery capacity 25mAh, charging compartment battery 200mAh; The earphones can be used for about 4 hours at a time, and the charging compartment can charge the earphones about 3 times. Bluetooth version V5.3, wireless transmission distance is about 10 meters, waterproof and sweat-proof design, charging compartment with power display; Tap the earphone button to switch songs, adjust the volume, hang up the phone, and wake up the phone's Siri voice assistant.