tourya b4 bluetooth headphones wireless headsets headphone earphone with mic bass stereo support tf card for pc smartphone music

1.bluetooth v5.0 & touch control: purer wireless audio via bluetooth v5.0, intelligent control makes technology essential to your modern life. 2.10-12h battery life & speed charge: tourya t7 bluetooth headphone offers 10-12 hours of exceptional audio quality on a single charge.and continue talking time up to10 hours, standby time up to 300 hours.(we have already upgrate the battery capacity from 250mah to 400mah)