Noise Cancelling Bluetooth Headphone

BH519 high-end Active Noise Cancelling Bluetooth Headphone, with the latest Bluetooth CSR 4.0 technology, you can listen to music or answer your phone within 20M (without obstruction)Wireless Range. This multifunctional pair of headphones will deliver amazing sound quality and lasting comfort. Features: Comfortable ergonomic design, lightweight and slim. Advanced CSR Bluetooth 4.0 technology, receiver range can up to 20 meters (without obstruction). 40 mm drivers for excellent bass, precise treble and clear mid tones, gives you a Premium sound. 350mAh built-in Lithium-ion rechargeable battery, enjoy 10 hours of uninterrupted music, podcasts, phone calls and movies before the next charge. On Board Controls, you can control your music quickly and easily. Equipped a 3.5mm stereo cord for quick and easy connections to devices without Bluetooth. Easy Pairing, no code required. Speaker Parameter Speaker diameter: 40mm Impedance: 32 Sensitivity: S.P.L: 110dB S.P.L.at 1KHz Rated Power: 20mW Frequency Response: 20Hz-20KHz Microphone Parameter Microphone Unit: 4 * 1.5mm 6 * 2.7mm Sensitivity: -42