Joyroom JR-X2 Wireless Air Conduction Headphone. Features: Open-ear design for safer outdoor activities, air conduction technology for healthy and comfortable listening, 8-hour battery life for daily needs, BT 5.1 for seamless connection, HD sound with intelligent noise cancellation, simple button design for one-hand operation, comfortable and stable fit. Specifications: Model: JR-X2, Type: open-ear, BT version: V5.1, BT profiles: HSP/HFP/A2DP/AVRCP, Speaker sensitivity: 113±3dB, Frequency response: 20Hz-20KHz, Impedance: 32Ω±15%, Rated power: 2mW, Speaker size: Φ14.2mm, Range: ≤12m, Playtime: ~8h (80% volume), Talk time: ~7h.