A Good Helper to Protect Your Hearing 1. What goods will you get? You get 1* Tactical Headset ,1*U94 type headset PTT. 2. What are the functions of this series of tactical headphones? This Version not Only has Communication Function, but also this headset has electronic active noise reduction and sound pickup technology,( sound collection function / soundproof function / hearing protection function), Runs on 2 AAA Batteries (not included) with waterproof battery cap 3.A Good Helper to Protect Your Hearing : When the ambient noise exceeds 80 decibels,this series of tactical headphones has a very obvious noise reduction effect, which is a good protection of our hearing!Because 80 decibels is the upper limit for ear comfort, Protect Your Ears This headset has electronic active noise reduction and sound pickup technology,( sound collection function / soundproof function / hearing protection function),It features a noise rate reduction of 21, suppressing any harmful noise above 80 DBA. THE RATE OF HEARING IMPAIRMENT CAUSED BY NOISE 80 DECIBEL：Upper limit of human ear comfort 90 DECIBEL：Many countries defined as occupational exposure limits 95 DECIBEL：Noisy bar, chainsaws slicing through wood 100 DECIBEL：Pneumatic drill, compression hammer strike sound 110 DECIBEL：Damage to the auditory system 120 DECIBEL：Propeller planes, rock concerts 125 DECIBEL：high pressure air rifle 130 DECIBEL：Jet plane takes off，pistol 140 DECIBEL：The European Union defines the threshold for total hearing loss 1.With a full 360-degree rotative design, the ear cups can be rotated to fold to the side or back of the tactical helmet. 2.Fit tactical Fast, MICH helmet,Arc rail adaptor version,compatible with arc rail side helmet,Fits for all 19-21mm rail,can be effectively fixed and not easy to fall. 3.How do you rotate 360 degrees?The arm of the adapter expands outwards 1.5cm and then rotate Tactical Headphone Adapter Features Be rotated 360 degree Update new version rail adapter can be rotated 360 degree will be easy to adjust possition of tactical headset,Flexibly adjust the angle, adjustable length for tactical Helmet wearing . The state of stretching and fitting Stretch out and let your ears relax, Expandability Tactical headphone stand with add-on expansion rail，Tactical accessories can be loaded,Such as flashlights, motion cameras and so . How To Install The Microphone 1. According to the usage habit, select the left or right microphone fixed socket, insert 2. Plug the microphone signal power cord into the corresponding port 3. Screw the screw into the retaining socket of the microphone,This step holds thmicrophone in place and prevents it from rotating With U94 type headset PTT Combined application of tactical headset +PTT+ intercom With U94 type headset PTT,Fit standard version plug Adapter Mobile 2 Pin 7.0mm Plug , fits for Kenwood 2 pin radio.theTactical headset has the NATO standard 7MM plug, It should work work perfectly. Application of PTT 2 pin plug and intercom Fits for Kenwood 2 pin radio The NATO standard 7MM plug theTactical headset has the NATO standard 7MM plug, It should work work perfectly. METAL CLIP Standard U94 type headphone connector with Serrated metal clip clip, the clip has a good bite force for attaching to clothes or MOLLE webbing strap tightly.