Features:-bluetooth 5.0 chip: lower power consumption, more stable.-Water and sweat resistant, waterproof for everyday use.-HiFi high fidelity sound surging heavy bass.-Lightweight and no burden.Specifications:Model: D10bluetooth: V5.0Chip: Jieli 6983/BT5.1Working range: 0-15mBattery: 40mAh*2+400mAh..