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Features : Bluetooth 5.4 ENC IPX 4 Water Resistant Polymer Lithium Stereo Sound Support Intelligent Voice Assistant 60Ms Low Latency 20 Hour Playback Time Specifications : Driver Size : 8mm Driver Sensitivity : 1kHz / 1mW (dB) : 102 +/- 3dB Dynamic Frequency Response Range (Hz) : 20 - 20000 Impedance : 16 Ohm +/- 15% Number of Microphone : 2 x MEMS Bluetooth Specifications : Version : 5.4 Wireless Range (Meter) : 10 Bluetooth Profile : HSP / HFP / A2DP / AVRCP Battery Specifications : Battery Type : Polymer Lithium Working Voltage : 3.7v Battery Capacity : 30 mAh Charging Case : 3.7v / 200mAh Charging Port : Type C Charging Voltage : DC 5v Charging Time from Empty : 1 Hour For Earphone , 1.5 Hour For Charging Case Earphone Playback Time @ 50% Volume Scale : 5 Hour Charging Case Playback Time : Up to 15 Hours What's In the Box : Jewel 2 Type C Charging Cable Ear Gel User Manual