CQB-NX Waterproof Close Quarters Battle Headset CQB-NX Waterproof Close Quarters Battle Headset Speaker The CQB-NX Waterproof Headset Speaker is an upgraded waterproof version of the CQB-NX. The CQB-NX Waterproof headset features a lightweight behind-the-head strap with a noise cancelling boom... MSRP: Was: Now: $95.00 Choose Options