HQRP® Hands Free with Earpiece and Push-to-talk Microphone! When you need to be discreet and leave your hands free to complete whatever important tasks land at your feet, you can't beat this neat little earpiece specially designed to meet your needs. Whether you're in security, retail, hospitality, or any other job that requires radio communication as well as a free hand or two, you can clip this earpiece onto your shirt and begin using your radio device to communicate discretely and easily. Combined with a PTT switch, a built-in microphone, and a clear acoustic tube connected to the earbud, you will have immediate access to quick and efficient communication. This headset has a remote lapel microphone with push to talk button you can clip almost anywhere and an acoustic tube with replaceable silicone insert that fits comfortably in the ear and keeps your conversations private and outside noise out! Excellent for use in police, military, nightclubs, bars, paintball, security, restaurants, hotels, bouncer, warehouses, and noisy environments.Resistance: 90Ohm±15%;Sound Pressure Level: 115dB S.P.L;Rated Power: 500mW;Max Power: 800mW;Microphone Sensitivity: -34 ± 2dB RL=2.2KOhm Vs=3.0V(DC) 1KHz 0dB=1V/Pa;Microphone Resistance: 2.2KOhm 1kHz (RL=2.2KOhm).