Features/Specifications: Foldable design makes the headphones easy to carry and store, perfect for travel or on-the-go use. Breathable and comfortable earmuffs ensure long-lasting comfort during extended listening sessions. Low latency and stereo sound deliver a seamless, high-quality audio experience with minimal delay. Wireless Version: bluetooth V5.4 Driver Size: 40 mm Impedance: 32 Ohms Sensitivity: 99 &; 3dB Frequency Response: 20Hz ~ 20kHz Battery Capacity: 3.7V/250 mAh Battery Standby Time Approx 100 hours 50% Volume Play Time: 10~12Hours Charging Port: Type-C USB Charging Time: 2~3 Hours 3.5mm auxiliary jack (3.5mm auxiliary cable included) Microphone: Built-in Working Distance: ≤10m