Leather arch, matte stainless alloy, and ease of folding and storing 2. Supports AUX and Bluetooth as audio resources 3. One voice-assistant button and three physical buttons 4. Bluetooth protocol: V5.1, JL6956A4. 5. 300mAh is the battery's capacity. 6. Diameter of horn: 40 mm 7. Duration of charging: 2 hours 8. Duration of play: 15 hours Dimensions: 20*18.5*8 cm 10. Type-C charging port Details: Scheme for Bluetooth: Jieli 6956A, V5.1 Protocols for Bluetooth: A2DP, HFP, AVRCP, SPP, and PBAP Dual-channel channel system 300mAh is the battery's capacity. Play duration: fifteen hours Time needed to charge: two hours Diameter of the horn: 40 mm 32Ω is the horn impedance. Sensitivity of the horn: 110dB ± 3dB <1m is the ideal transmission distance. Ten meters is the maximum transmission distance. Range of frequency response: 2,402 Hz–2,480 MHz Method of wear: head-mounted Interface for charging: Type-C English and Chinese user manuals