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The Bluetooth earphone with power bank F9 is a complete Bluetooth headset with real wireless stereo HIFI sound, and they may be used singly or in pairs. Dual-mode Bluetooth 5.0, ultra-low power consumption, barrier-free Bluetooth transmission distance of 10 meters, 3–4 hours of song listening time per song, built-in 2000mAh large capacity battery, 25 charges for headphones, 120 hours of standby time, and CVC8.0 noise cancellation technology are some of its features.