Bluetooth Bone Conduction Sleep Speaker Smart Improve Sleeping

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Product information: Color: twilight gray, dark blue, pink Frequency range: 100HZ-20KHZ Charging mode: Type-c fast charging Bluetooth version: 5.2 Product Size: 100*28*13(mm) Built -in battery: 400mAh lithium polymer Operating voltage: 3.7V-4.2V Transmission Distance: 10 meters (barrier-free) Packing list: 1*Speaker Product Image: Show more