REMAX SLEEPBUDS Z2 DREAMER Bluetooth wireless earbuds – black color Features Bluetooth Version: V5.3 Transmission distance: up to 10m Driver unit: 6mm Frequency response: 50Hz-20KHZ Rated power: 3.0mW Impedance: 16 Battery Standby time: up to 20H Playtime: 5H Charging time: 3 H Earbud battery capacity:30mAh More earphone