Item Type: Bluetooth HeadsetMaterial: ABSBattery Type: Built in 400mAh Lithium Ion Battery (Included)Memory Card: Support Up to 32GB (not Included)Bluetooth Version: Bluetooth 5.1Transmission Distance: 10 MetersFrequency Range: 20Hz to 20KHzSpeaker Size: Approx. 40MM/1.6inImpedance: 32Package List1 x Bluetooth Headset1 x Microphone1 x Sound Cable1 x Charging CableAll data are measured manually, and there are certain errors in the measurement results.1BLUETOOTH 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. 2DUAL 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. 3ADJUSTABLE 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. 4STEREO 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. 5COMFORTABLE 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.