Specifications Model:B&O H9i Wireless Over-ear Headset Microphone: Yes Noisecancelling: Yes Wireless: Yes (Bluetooth 5.0) FM Radio: Support (87 - 108M HZ) TF card: Support (32G max) Frequency: 2.4-2.4835G Sensitivity: 105±3dB Resistance: 32Ω Playtime: 5 Hours Standby Time: About 180 hours Charge Time: 2 Hours Charge Port: USB Battery Type: Lithium Battery Capacity: 250m AH Active Noise Cancelling and Bang & Olufsen Signature Sound. Silence your surroundings to immerse yourself in pure musical bliss. Advanced Active Noise Cancellation The over-ear headphones deliver Bang & Olufsen Signature Sound with advanced ANC. The acoustics are expertly tuned by our sound engineers to deliver rich and powerful listening experiences. Transparency Mode lets you hear your surroundings, when you need to. Luxurious Design The elegant over-ear cushions wrap your ears in soft lambskin and adaptive memory foam for an ultra comfortable fit, even during extended use. Polished, anodised aluminium and genuine cowhide leather complete our most luxurious design yet Keep your phone in your pocket Tap and swipe to answer calls, skip tracks, adjust the volume and more. With intuitive touch gestures directly on the ear cups, you have quick access to your most used features without needing to take your phone out. Attention: 1.The heaset is not waterproof, please keep it from WATER to ensure the normal function. 2.To extend the battery life of the headset, please charge and discharge once a week. 3.When the headset don't function normally, try to the reset it. ---Quick Guide for Bluetooth Press the M key to switch to Bluetooth mode, and the Bluetooth is turned on when the indicator light flashes straight. Turn on the Bluetooth of your devices and search for the headphones to connect. ---Quick Guide for Mic-SD card player Put the TF card into the headphone slot, and press the M key to switch to reader mode to decode the audio format files. When the blue indicator light flashes, you can play the music from the TF card. ---Quick Guide for FM Radio Presse the M key to switch to FM mode and the indicator start to flash blue. When a hissing sound is heard, just press the play button, and then the headset will automatically search for radio channels. Channels search is completed when the indicator stop blinking. And you can press and - to switch radio channels. ----Quick Guide for Reset To reset to headset, you need to use a needle to slip the "reset" key which is in the bottom of the 3.5mm audio jack. Note： 1.As different computers display colors differently, the color of the actual item may vary slightly from the above images . 2.physical measurements, 1-2 cm error belongs to the normal range.Thanks for your understanding. Package Included: 1 * B&0 H9i Overear Headset 1 * USB Cable 1 * Quick Guide