Specifications Bluetooth Version: V5.3 Net Weight: 3.7g*2(Earbuds)/33g(Charging case) Talk time:4H(50% Vol.) Charging case dimension: 55*35*20mm Wireless Working Range: 10M (without obstacles) Speaker Size: Φ10mm Earbuds Battery: 28mAh*2(Fully charged in 1.5H)