AUX and Bluetooth support for a foldable, matte Bluetooth headset Version 5.1 of Bluetooth (Jieli 6956A) 300mAh is the battery's capacity. Battery life: 2 hours; play time: 15 hours Horn dimensions: 20 * 18.5 * 8.2 cm; diameter: 40 mm Voice assistant: compatible Interface for charging: Type-C Details: Protocols for Bluetooth: A2DP, HFP, AVRCP, SPP, and PBAP Dual-channel channel system 64 Ω is the horn impedance. Sensitivity of the horn: 110±3db The ideal transmission range is one meter. Ten meters is the maximum transmission distance. Method of wear: head-mounted English and Chinese user manual