Brand from Switzerland: LIFETRONS. Origin from Swiss.Combines health, relax and travel in one multifunctional negative ion headphone.Product 5 million negative ion particles in every cm3.It affectively reduces dirt particles in air, which resulting in air purification.Efficiently improve air quality:Advanced negative ion technology: The dirt and harmful particles in air will stick to the negative ion particles.Heavier particles will not be floating around your mouth area.Bluetooth music, answer calls with just one button:Connect headphone Bluetooth to your mobile phone.It produces smooth and clear sound for you anytime anywhere.Specifications:Bluetooth version: 4.1Bluetooth transmission: 10MAni concentration: 10CM within (300-5000000 cm3)Input voltage: 5VPower: 1W (Max)Power supply: USBBattery capacity: 350mAh