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,This step is important for the stability of the microphone,Buyers complain,The mouth mic spins around loosely.The important reason is that the screws are not fixed properly Hdlsina Tactical Headset + with U94 PTT 2pin with ARC Rail Adapter Compatible FAST helmet ACH helmet MICH helmet Black 1.What are the functions of this series of tactical headphones? This Version Only has Communication Function, this headset don't uses electronic active noise reduction and sound pickup technology,No need to install battery, battery Slot and Buttons is For Decoration Very valuable combination:Equipped with The Multifunction ARC rail adapter,With a full 360-degree rotative design, the ear cups can be rotated to fold to the side or back of thetactical helmet. 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. khaki 1.What are the functions of this series of tactical headphones? This Version Only has Communication Function, this headset don't uses electronic active noise reduction and sound pickup technology,No need to install battery, battery Slot and Buttons is For Decoration 2.Very valuable combination:Equipped with The Multifunction ARC rail adapter,With a full 360-degree rotative design, the ear cups can be rotated to fold to the side or back of thetactical helmet. 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. Geen 1.What are the functions of this series of tactical headphones? This Version Only has Communication Function, this headset don't uses electronic active noise reduction and sound pickup technology,No need to install battery, battery Slot and Buttons is For Decoration 2.Very valuable combination:Equipped with The Multifunction ARC rail adapter,With a full 360-degree rotative design, the ear cups can be rotated to fold to the side or back of thetactical helmet. 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. Hdlsina Tactical Headset + with U94 PTT 2pin with ARC Rail Adapter Compatible FAST helmet ACH helmet MICH helmet Flapping Up or Down The spring and Rotation of brackett mounting design,the bracket arm can be flapping up or down,When not in use, Flip to the back of the helmet It can be folded behind the helmet for storage with management cable latches The tactical helmet connection arm comes with a buckle for the management wire, The headphone cable can be stored and organized to prevent the messy headphone cable Come With Two Adapters Compatible with both OPS Core and Team Wendy M-LOK Rails Head Wear Mode The way tactical headsets are worn, Suitable for many occasions, such as shooting,hunting,chainsaw,machining or in a noisy environment. Tactical helmet and ARC helmet rail adapter application The rail adapter is compatible with the full range tactical FAST helmets, ACH helmets, MICH helmets with OPS Core ARC rail on the sides This ARC helmet rail adapter can be rotated 360°,The card position of ARC Rail Adapter Accessories on the headset can also be rotated. the bracket arm can be easily extended and shortened,Adjust to a comfortable position Tactical headphone wire fixed display The attached double-sided hook and loop tape can match the helmet hook and loop and the tactical headphone wires can be arranged to reduce the clutter of the wires Compact Design Small size, easy to carry A retractable headband It can fit all head sizes Detachable microphone Removable microphone, 2 sides microphone port convenient for right and left use