This is a commercial grade Nextel Headset. This headset is worn behind the head, allowing you to wear it with headgear. It is extremely heavy duty for rugged tasks and is perfect for Firefighters, Construction workers, Airport Tarmac workers and more. This heavy duty, professional grade Nextel headset has a noise canceling dynamic microphone with 24dB NRR. It features a water resistant, ABS plastic earshell with cushioning and integrated PTT function. Having the PTT switch on the earshell is great for people who wear gloves while working. This Nextel headset is comfortable, durable, and perfect for professionals working in demanding environments.