Sordin's slim cup and headband design allows the headset to be worn under ballistic helmets The digital electronic design of the Sordin is controlled by a micro-processor. This makes it possible to combine very low current consumption with high performance. Clear, natural stereo sound reproduction from the Sordin Similar headset as used by military special forces Military standard jack 6.3mm Slim design cups for both right and left-handed shooters Low profile design allow wearing under helmet or headwear Amplifier for the surrounding sound,operated by 1x AAA battery with waterproof battery cap Adjustable volume control Adjustable size for comfort wearing New design ear cup provide clear voice and comfortable support Boom mic with movable arm E6Perfect for outdoor war game activities√ Noise cancellation Waterproof button Powered by 2 x AAA battery ( not included )