1. The earmuffs adopt PU leather material, comfortable and soft to wear. 2. Ear protective headset, effectively reducing the noise, long time wearing without fatigue. 3. Equipped with flexible cable, increasing the distance, to use. 4. Suitable for home telephone, also applicable to office use, stable performance. 5. Plug and play, directly plug into the socket of the landline phone handle to use. Spec: Item Type: Headset Condition: brand new Material: ABS Color: Black Frequency Range: 100-5600Hz Sensitivity: SNR: >58dB Ambient Temperature: -10-40℃ Relative Temperature: 10%-90% Package List: 1 x Headset 3 x Crystal Connector Notice: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.