Bluetooth Headphones Over Ear Wireless Noise Cancelling Headphones Foldable Stereo Earphone Super Bass Headset Bluetooth Headphones Over Ear Features: Adopted Bluetooth 4.1 technology for stable signal transmission and high sound quality You can use it as a wired headphone with a 3.5mm audio cable Support TF card music playback Support battery icon display on mobile phones With built-in mic, support hands-free calls Soft and elastic protein earmuffs, comfortable and painless after long time wear Built-in 400mAh battery offers 6h music time after 2.5h of charging Folding design makes it easy to carry around Bluetooth Headphones Over Ear Wireless Noise Cancelling Earphones Foldable. Fold and adjustable design. TF card can be inserted. HANDS-FREE CALLING: Built-in microphone Wireless Headphones Bluetooth Specification: Item Type: Bluetooth Headset Bluetooth Version: 4.1 Transmission Range: 10m Built-in Battery Capacity: 400mAh Charging Time: 2.5h Music Time: 6h Color: Black | Black + Red | Black + Blue Note: Please allow 1-3cm (0.4-1.18") difference due to manual measurement and slight color variation for different display setting. Package Includes: 1 x Bluetooth Headphones 1 x Audio Cable 1 x USB Cable 1 x User Manual