New KS19 Concept Bone Conduction Wireless Ear Up Bluetooth Earphones

KS-19 bone conduction concept Bluetooth earphones sound conduction air conduction non in ear hanging neck hanging neck hanging Bluetooth version: V5.1 version Battery: 110MAH Call time: approximately 8 hours Music time: approximately 8 hours Communication distance: about 10 meters Battery type: Lithium polymer battery Protocol: HEP/HSP/A2D/AVRCP Frequency: 20Hz-20KHz Impedance: 32 ohms Sensitivity: 85dB/mW Waterproof grade: IPX 5 Horn material: copper ring horn 14.2mm Appearance material: ABS Bare metal size: 15 * 4 * 0.7CM Bare metal weight: 18 grams Complete set size: 17.5 * 9.6 * 1.8CM