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140mAh Bluetooth 5.0 Air Conduction On-Neck Wireless Earphones JR-X2 Features: Open-ear design, safer for outdoor activities Air conduction technology, healthy & comfortable, protect your ear 8h battery time, satisfying daily needs BT 5.1, connect without delay HD sound experience, intelligent noise cancellation Simple button design, one-hand operation Smart touch control, easy to operate Comfortable and stable wearing Specification: Brand: Joyroom Model: JR-X2 Material: ABS + silicone BT version: V5.1 BT profiles: HSP/HFP/A2DP/AVRCP Speaker sensitivity: 113±3dB Frequency response range: 20Hz-20KHz Speaker impedance: 32Ω±15% Rated power: 2mW Speaker size: Play time: about 8h (80% volume) Talk time: about 7h (80% volume) Standby time: about 48h (connected) Headphones battery capacity: 140mAh