Equipped with productive late-model active anti-noise transmitter-receiver factory and company, Fenghuo Hongsheng is one of the leading China headset wireless manufacturers and suppliers. Welcome to contact us. Late-model Active Anti-noise Transmitter-receiver adopts carbon fiber which features high density, light weight and nice strength, and not only lightens weight but also improves the comfortable wearing. The optimal design of lumen structure and active anti-noise technology further improve the performance of noise isolation and tone clarity. The product is suitable for being used in different noise environmental conditions. Main Technical Specifications: Frequency response range: 200Hz～4000Hz; Transmitting average sensitivity ≥-60dB/Pa(200Hz～4000Hz); Transmitting impedance: 150(1±15﹪)Ω(1000Hz); Receiving average sensitivity ≥90dB/mW(200Hz～4000Hz); Receiving impedance: 600(1±15﹪)Ω(1000Hz); Average sound isolation amount of earmuffs ≥20dB(315Hz～4000Hz); Active noise reduction amount: Max. ≥12dB,Min. ≥6dB(63Hz～315Hz); Weight ≤300g.