TS TAC-SKY Active Noise Cancellation Tactical Headset TAC-L Silicone Ear Cushion + PTTDescription: 1. The built in chip is upgraded to a digital signal chip, better performancewhich can make your conversation communication more stable. 2. The headset includes two frequency modes that provide the freedom to switch between indoor and outdoor noisy environments with different conditions, controlled by soft touch digital buttons. Speech Enhancement looks for speech in background noise and actively filters the noise to improve speech