Product details of Awei A997 PRO ANC Wireless Stereo Headphone Bluetooth with Mic Noise Cancelling Long Battery Life Explosive BassWhat's in the box1 x Awei A997 Pro1 x Charging Cable1 x ManualSpeaker SpecificationDriver Unit: 40mmSensitivity: 110dB ±3DBImpedance: 32ΩNote:1. Due to the difference between different monitors, the pictures may not reflect the actual color of the item.2. Compare the detail sizes with yours, please allow 1-3 cm error, due to manual measurement.3. Please leave a message before you give the bad feedback, if the products have some problems.4. Thanks for your understanding.Try us ! we will not let you down!