LA-454 Headset 4 Over Ears Dual with Boom MicListen Technologies LA 454 headset features a boom mic for hands free communication, and incorporates a dual over ear speaker design to offer improved noise isolation and increased clarity in high noise environments. Product Features Increased noise isolation thanks to a dual, over the ear design Built in boom mic for added convenience Ideal for hands free communications in high noise environments Protect hearing with Noise Reduction Rating of 23. 7