Riversong Utopia L1 (EA219) TRUE WIRELESS STEREO EarbudsANC-Active Noise CancellationLight and Compact DesignComfort-fit wearingHD sound
Bluetooth chip :BT8892EBluetooth version :BT5.0Driver spec:φ10mm / 32ῼFrequency range:2.4-2.48GhzTransmission distance :Up to 10мBattery capacity ( headphone):40mAhBattery capacity(Charging box):300mAh
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