Wired & Wireless Connection: Advanced Bluetooth 5.4 chip offers a connection within 10m of your device. The headphone comes with a 3.5mm audio cable, meaning you can switch to wired mode and enjoy your music non-stop (Audio Cable Not Included) High Definition Stereo Sound: Equipped with powerful 40mm moving coil, it aims to deliver you superior sound quality with high fidelity deep bass and crystal clear treble Easy to Carry: The earmuff is foldable, which makes it compact and easy to store or carry outdoor Soft Earmuff & Adjustable Headband: With an adjustable headband and soft earmuff, the headphones fit snugly in your ears for a better acoustic experience and immerse yourself in full sound, comfortable to use Practical Function: Supports automatic switching between phone calls and music, previous/next song selection, play/pause Specification: Bluetooth version: V5.4 JL AD6956 Channel system: stereo (dual channel) Driver unit: 40mm Supported protocols: HFP, A2DP, AVCTP, AVRCP Standby time: 25h Talk time: 13h Signal-to-noise ratio: ≥58db Music playback time: 12h Charging time: 1h Bluetooth operating frequency: 2402MHZ-2480MHZ Transmission distance: 10m Battery capacity: 250mAh Built-in Speaker: Driver: 40mm Sensitivity: 122dB±3dB Impedance: 32Ω ±15% Frequency response: 20-20KHZ TF card playback: support (Card Not Included)