A. The invisible earplugs are designed according to the ear shape. They adopt a compact design style, are lightweight, and can fit firmly on the ear hook. They are suitable for long - term wearing, unlikely to cause discomfort to the ears. B. The main body of the earplugs is designed to be small and less noticeable. If you like to wear earplugs to sleep and dislike the feeling of a foreign object in your ear when sleeping on your side, then these sleep earplugs could be suitable for you. They won't squeeze your ears when you sleep on your side. The U - shaped rubber skin - friendly ear caps can help keep the earplugs fitting your ears throughout the night. C. These invisible earplugs for work are convenient to use. With a built - in microphone, you don't need to take out your phone. Just tap with your finger, and you can easily switch between pausing music, answering calls, rejecting calls, or tracking music. D. Invisible wearing experience: These are relatively light earplugs, with a size within 1 cm/0.4 inches, and each sleep earplug weighs only 0.08 ounces. They feel light and natural, and you can hardly notice their presence. E. Dual noise - reduction technology: The combination of physical noise reduction and acoustic noise reduction technology allows you to use the sleep earplugs to enjoy a quieter sleeping time, away from snoring and the noise of babies. F. 24 - hour long battery life and fast charging: The sleep earplugs can play music for up to 24 hours. The stylish charging case can extend the usage time to 480 hours, which means the charging case can provide an additional 7 charges for the invisible earplugs. Using micro fast - charging, 10 minutes of charging can allow you to listen to music for about 91 minutes. G. Sound and safety guarantee: These sleep earplugs offer an audio experience. With the whale - cavity stereo surround sound effect, you can enjoy a more immersive music experience. They can be good sleep companions. If you encounter any problems during use, please contact us at any time, and we will try to solve them for you within 25 hours. H. Bluetooth 5.3 and fast connection: The Bluetooth 5.3 chip in the invisible Bluetooth earplugs provides a relatively high - speed and stable connection, with a stronger signal, faster connection speed, and is mostly compatible with all Bluetooth - enabled devices. The transmission distance can reach up to 15 meters. The connection is simple and fast, and you can enter the music world within 2 seconds. I. Specification parameters: - Bluetooth version: 5.3 - Transmission distance: about 15 meters - Standby time: 480 hours - Charging time: 1 hour - Play time with the charging case: 24 hours - Supported systems: all Bluetooth - enabled devices and mobile phones J. Precautions: - Please read the instruction manual carefully before use. - If you receive a defective product or encounter any problems during use, please contact us at any time. K. Package list: - 1 pair of wireless mini earplugs - 1 USB cable - 1 user manual