These earbuds with 2 horns a-tuned balanced armature driver for each earbud, delivering powerful and vivid stereo sound with deep bass. Through Bluetooth 5.1 Wireless headset audio technology and enhanced voice clarity. This headphone designed with curved neckband and made of extra durable & flexible materials, bringing you more comfortable wearing experience. IPX5 sweatproof technology protect the headphone from sweating damaged while you’rerunning,jogging,hiking,climbing,bicycling,yoga,gym... indoor outdoor sports. The Bluetooth Neckband Earphones have an optimized earbud angle for comfortable fit in the ear canal. They can fit almost all ear shapes.