iKF Sun Invisible Sleep Wireless Earbuds Bluetooth Mini Lightweight EarphonesABOUT iKF Sun Due to the need to place chip motherboards, batteries, speakers and other components in the ikF Sun body, we used our own precipitated R&D technology for many years, lasting one year, and finally overcame various difficulties and developed a more professional sleep Bluetooth headset ikF Sun. PHYSICAL NOISE REDUCTION Designed for insomnia people, iKF spent one year only for one kind of sound and noise reduction sleep Bluetooth headset,