Active noise reduction head-mounted Bluetooth headset with ultra-long battery life metal retractable Bluetooth 5.3

Frequency response range: 20-20000HZ Distortion rate: 10% of the whole machine Wire length: 1m+10% Speaker diameter: 40mm Earplugs/earmuffs material: leather Headphone cable material: cable material Purpose: Bluetooth headset Headphone Category: Headphones Features: Three sound effects switching Wearing method: head-mounted Distortion rate: 10% of the whole machine