ATN X-Sound Hearing Protector Electronic Earmuffs w Bluetooth 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, while built-in wireless capability enableshands-free calling and music enjoyment. Or, connect a playing device via the 3.5 mm audio jack. Features include 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. Sound Activated Compression: 0.02 s Reaction Time; Bluetooth version: 5.0; NNR: 22 dB; Battery type: 2 x AAA. Ultra low-profile ear cups. Two high gain omni directional microphones. Recessed volume control knob; Compact folding design. Pair to smartphone and make calls or listen to music. Country of Origin: China. Unit of Measure: EA. Item LxWxH: 3.70 X 0.50 X 4.90.