BT speaker 551
Rated power: 5W
Battery capacity: 400mAh
Signal-to-noise ratio: 285dB
Bluetooth version 5.0
Battery type: Polymer battery
Frequency response: 60HZ-120KHZ
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BT speaker 517
Box material: Plastic
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Built in battery capacity 2000mAh-4000mAh (inclusive)
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Signal to noise ratio ≥ 75dB
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Signal to noise ratio ≥ 70db
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BT speaker 543
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