Crystal clear audio sound quality, with up and dowm adjustable volume control button conveniently located on the left ear cup. Real noise cancellation,24dB noise reduction rating,professionally designed for two-way radio intercom communication in high noise loud noisy environments,like auto racing event,racetracks, big rock concert,construction site and other high noise workplaces. Headband over the ear earmuffs headphone;Adjustable headband can accommodate different head sizes;Adjustable dynamic noise cancellation sound pick-up microphone;3.5mm Input Jack for Music & Scanners With tactical U94 ptt adaptor compatible with Motorola XPR XIR MTP TETRA DP DEP Series walkie talkie models like XPR 3000 3300 3500 3000e 3500e 3300e;XIR P 6600 6620 6600i 6608 6628;XIR E8600 8608; MTP 3100 3150 3250 3200;DEP 550 570 500e;DP 2000 2400 2600 3441 2600 etc. 2-way radios Inside package: 1 headphone + 1 u94 ptt ( Please notice, no batteries included, if you need to use the noise reduction function, please put 2pcs AAA batteries before use.)(If you do not need noise reduction function, with or without battery does not matter.) 1. Great audio quality for incoming and outgoing transmissions, perfect clarity;Great audio quality for incoming and outgoing transmissions, perfect clarity 2.Impressive noise-canceling technology; actually prevents noise;perfect for two way communication in noisy loud environment,like construction site, big rock concert etc. 3. Convenient push-to-talk button 4.Durable for rigorous use ; professional durable dependable communication headset;Solid headset in loud environment