S300 Ear-hanging New High-quality Bluetooth 5.4 Without Feeling Comfortable Wearing Long Endurance Digital Display Universal

function: bone conduction 
function: long endurance
function: call function
function: support music
function: electric competition low delay
bluetooth protocol: 5.49
usage: ear-hung
single and double ears: bilateral stereo
chip type: Huawei 
endurance: more than 8 hours
style: sports style
number: s300
waterproof performance: life waterproof