Name on Bluetooth: Lenyes Air 81 Color: Black with a version for digital displays Version of Bluetooth: V5.1/JL6973D4 10M is the Bluetooth distance. Protocols supported: ACC SBC, AVRCP, AVCTP, AVDTP, HFP, A2DP, and HID capacity of the battery: 300 mA charging compartment battery (60–2030 mA with protective plate) 40mah * 2 lithium-powered headphones 6 hours of playback at 100% volume The charging compartment takes 1.5 hours to charge. 1.5 hours of headphone charging and 100 hours of standby 5V-1A for charging Headphones can be charged 2.5–3 times with a charging box. Details of the horn: φ 13mm composite membrane horn 32 Ω is the impedance. Response frequency: 20 Hz–20 kHz It is sensitive to 96 ± 3dB. Weight of the product: 54 * 45.6 * 27.8 mm Net weight of bare metal: 34.2g Type-C charging port for charging