Bopai 61-93318A Hard Shell Waterproof Expandable Backpack with USB Charging Hole, Spec: Password (Black) Filter-Extension Ring Headphones pressure-sensitive touch control

Headphones pressure-sensitive touch control

Transmitting Power: about 4dB

40HQ: 454 cartons * 10 pcs = 4540 pcs

Protect battery contacts

Bopai 61-93318A Hard Shell Waterproof Expandable Backpack with USB Charging Hole, Spec: Password (Black) Filter-Extension Ring Headphones pressure-sensitive touch control1. Material: PC, polyester 2. Function: waterproof, wear resistant, anti theft, shock resistant, capacity expansion, load reduction 3. Accommodates computer size: 17. 3 inches 4. The PC is pressed into one piece, and carbon fiber material is added, which is wear resistant and impact resistant. 5. The fan shaped half open bag design makes it more convenient to take items 6. The back adopts hollow groove design to enhance air convection and effectively