Feature: 1. Noise Cancelling: Bluetooth headset built in premium noise cancellation technology, shield your unwanted noise, hear the sound you want to hear, enjoy the heavy bass. 2. Retractable And Foldable: This over ear Bluetooth headset features a retractable headband design to accommodate a variety of head sizes. Flexible and foldable, easy to carry. 3. Compatible Devices: The over ear wireless headphone has a wide range of compatibility, supporting devices with Bluetooth function, such as tablets, cell phones, computers, etc. 4. Lightweight And Comfortable: Wireless headphone uses premium protein leather ear cups, soft and delicate touch, skin friendly, airtight and no sound leakage. 5. Multi Play Method: The headset supports plug in, wired and Bluetooth three types of connection to meet your different needs. Suitable for running, sports, etc. Specification: Item Type: BT Headphone Material: ABS Product Size: Approx. 18 x 19 x 7.5cm / 7.1 x 7.5 x 3in Product Color: Black Speaker Size: Approx. 40mm/1.57in Battery Type: Lithium Battery 400mAh (Built in) Usage: Over Ear Sound Channel: Stereo. Package List: 1 x BT Headphone1 x Sound Cable1 x Data Cable1 x Instruction Manual Note: Manual measurement, please allow some errors.