DR57 Gradient Bluetooth Headphones — Green

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<ul> <li><span data-spm-anchor-id="a2g0o.detail.1000023.i0.5c64clPaclPa7e">USB charging: type-c</span></li> <li><span>Signal to noise ratio: 88db</span></li> <li><span>Bluetooth link distance: 10 meters</span></li> <li><span>Output power: 35mW</span></li> <li><span data-spm-anchor-id="a2g0o.detail.1000023.i1.5c64clPaclPa7e">Bluetooth frequency: 2.401-2.480GHz</span></li> <li><span>Charging time: 4 hours</span></li> <li><span>Usage time: 6-8 hours</span></li> <li><span>Standby time: 18 hours</spa

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