Stereo Sound Quality: STONEGO headphones is passive noise isolating. Provides immersive CD-like HIFI music clear stereo sound with 40 MM larger driver and latest decode tech together. Superior Comfort: Custom soft protein earmuff and adjustable headband with skin-friendly rubber layer, more durability and comfort, allow your to find the perfect fit and a long-listen comfort. Noise Reduction HD Mic: Simple build-in control can help you handle any call, song switch, volume change, enjoy the convenience of wireless. (The mic only work in wireless mode.) Foldable and Portable Design: Stonego Foldable space-saving design makes it easy to carry and store when not in use or travels. TF Card and Wired Mode: Support TF card, pre-store music files to play, breakpoint playback function. Also, you can use Stonego as a wired headset with provided audio cable when battery low. Specification Name: Foldable Wireless Stereo Headphones Bluetooth Version: V5.0 + EDR Bluetooth Profiles: A2DP /AVRCP /HSP /HFP Wireless Range: ≥ 33ft Frequency Response: 20-20kHZ Sound Pressure Level: 120 ± 3dB Driver Diameter: 40mm Battery: 400 mAh Play/Call Time: 8-10 Hrs Charging Time: 2-3 Hrs Net Weight: 8 oz/ 228 g Function: Foldable, Noise canceling, Handfree calling, Soft earmuff, Wired mode support Package Included: 1 x STONEGO Bluetooth headphones 1 x USB Charging Cable 1 x 3.5mm Audio Cable 1 x User Manual 1 x Package Box