Chipset: Actions Solution Bluetooth V5.0Waterproof Level : IPX4Dimension of Each Earbud : 15.4 * 33.5mm; Weight of 2 Earbuds: 8.4g;Dimension of Charging Case : 54.6 *87.6 * 43.8mm;Charging Time for Earbuds : About 2hrsBT Files: HFP/HSP/ A2DP/ AVRCPVoice Promp: EnglishVoice-Controlled AI: Yes, Siri & Google AssistantBattery of Charging Case : 500mAh capacity charging case provide about 2-3 times additional charging for 2 earbudBattery Type : Lithium Polymer BatteryVoltage : 3.7V (under normal condition)Lifetime : ?300 timesCapacity : 50mAh + 50mAhTalk Time: Up to 4hrsMusic Playback Time : Up to 4hrsStandby Time : Up to 100hrsSpeaker :8φ mm