ATN X-Sound Hearing Protector Electronic Earmuffs w/ Bluetooth NNR: 22 dB ACPROTXSND. ATN X-Sound reduces harmful loud noise down to safe levels below 82 dB and enhances clarity of surrounding low level sounds such as conversations and announcements. The ergonomic volume control knob allows for total adjustment of the two built-in omni directional microphones, recessed volume control knob, compact folding design, pair to smartphone and make calls or listen to music. Sound Activated Compression: 0.02 s Reaction Time; Bluetooth version: 5.0; NNR: 22 dB; Battery type: 2 x AAA – Bluetooth wireless technology – Ultra low-profile ear cups – Audio input jack – Two high gain omni directional microphones – Recessed volume control knob; Compact folding design – Pair to smartphone and make calls or listen to music. Manufacturing defects vary by individual Brands. We will give instructions as what is to be done on a case by case basis.