DescriptionTheheadset can easily and quickly connect with smartphones, tablets, TVs and otherdevices within 33 feet. The foldable design makes it easy to store them when not in use or during travels. Adopted advanced4.0 technology and fast pairing function, when high connecting, bring higher-quality stereo sound experience. Delivers deep, immersive sound at any volume, making them the bestwireless headphones available.Features- Color: Black Blue.- Material: Plastic.- Size: 18.5x18x8.5cm / 7.3x7x3.3inch.-version: 4.0.-protocol: A2DP 1.2 / AVRCP1.4 / HSP1.2.- Drive unit: 40mm.- Operating range: 10M.- Battery capacity: 320MAH.- Talk time: 6 hours.- Standby time: 72 hours.- Cable length: 100cm.- Sensitivity: 103plusmn; 3db.- Impedance: 32Omega;.- Frequency response range: 100-10000Hz.- The foldable design makes it easy to store them when not in use or during travels.- breathable ear muffs and Flexible Headband makes it a pleasure to wear for long time.- Adopted advanced4.0 technology and fast pairing function, when high connecting, bring higher-quality stereo sound experience. Delivers deep, immersive sound at any volume, making them the bestwireless headphones available. Stream your music wirelessly up to 10m/33ft.- Our wireless headphones were designed to not only look awesome, but to feel great so you can wear them for as long as you desire.- With an attached audio cable, you can still enjoy favorite music when the battery is flat.