Designed For Perfect Fit: For make sure the cable lock in place to ensure a secure connection, we add jack lock system on the stereo Aux cable. You don't have to worry about any connection problems when connecting the jacks and sockets. Memory Earcups: The breathable protein skin earmuffs and the soft sponge inside improve the wearing experience, guarantees good sound insulation and there is no discomfort for long-term wear. Music or Sound Sharing: pair your device via bluetooth and share your tunes through the audio cable, 2 or more people can share music moments at the same time. Receiving Music at Both Ends: Connect two devices with a 3.5mm cable and another 6.3mm cable, and the music at both ends will be transmitted to ear at the same time, such as connect your ipad and guitar simultaneously. Professional Sound Quality: The Bluetooth + wireless dual mode headphones feature 4.0 Bluetooth technology and 24-hour playback time to deliver a high quality and comfortable sound quality experience. 50mm Dual-Diaphragm Drivers - inner & outer rings deliver vibrant bass, vivid mids & vivacious highs without overlap. Specifications: Speaker: 40 mm Impedance: 32Ω Sensitivity: 105±3dB 1kHz Bluetooth Ver: Bluetooth 4.0 Wireless Range: >=12m Battery: 430mAh Polymer Battery Playing Time: Up to 25 hours Talking Time: Up to 18 hours Charging Time: About 2.5 hours