Features 1.BLUETOOTH 5.1: Wireless headset uses the latest Bluetooth 5.1 technology to provide you with a perfect connection to any Bluetooth compatible listening device. With external microphone for mobile phone, tablet, PC, laptop. 2.DUAL MODES: When the headphone is in Bluetooth mode, long press the switch button for about three seconds to turn it on. The additional detachable 3.5mm sound cable can also be connected to any device with a 3.5mm headphone jack. 3.ADJUSTABLE HEADBAND: Wireless Bluetooth headset is designed with an adjustable headband so it fit the shape of your head perfectly, is easy to store and carry, and is convenient to use anywhere. It's the ideal gift for kids, family and friends. 4.STEREO SOUND: Wireless headset offers stereo HiFi grade sound quality and powerful bass, and helps you enjoy your music better. The built in microphone and volume control let you answer calls and play and pause songs with the push of a button. 5.COMFORTABLE TO USE: Super soft memory protein foam leather ear cushions and headband provide maximum comfort. We recommend that you remove the headset every 2-3 hours to allow your ears to relax for better listening enjoyment and to keep your head more comfortable. specificationItem Type: Bluetooth Headset_x000D_ Material: ABS_x000D_ Battery Type: Built in 400mAh Lithium Ion Battery (Included)_x000D_ Memory Card: Support Up to 32GB (not Included)_x000D_ Bluetooth Version: Bluetooth 5.1_x000D_ Transmission Distance: 10 Meters_x000D_ Frequency Range: 20Hz to 20KHz_x000D_ Speaker Size: Approx. 40MM/1.6in_x000D_ Impedance: 32 PackageList 1 x BluetoothHeadset 1 x Microphone 1 x Sound Cable 1 x ChargingCable NoteAll data are measured manually, and there are certain errors in the measurement results.