1 Pair Headphone Units 40MM Driver Edge PET, Bluetooth Headset DIY Unit, Noise Reduction, Composite Advanced Audio Technology: Experience superior sound with 40MM driver units featuring Edge PET technology for crisp, clear audio. Ideal for DIY headset enthusiasts. Enhanced Noise Reduction: Designed to deliver a quiet listening environment, these headphone units utilize advanced noise reduction technology to minimize external interference. Optimal Impedance & Sensitivity: With an impedance of 32Ω and a sensitivity of 111dB, these units high-quality sound reproduction and dynamic range. and Reliable: Built with a High-quality materialsthat enhances sound quality and durability, making them perfect for personalizing your listening experience. Color: Black Material: plastic Package Contents: 2 x G402B Headphone Units Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.