"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"