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A520 Bluetooth Earphone Parameters Bluetooth version: 5.3 Charging input: Voltage: DC5V ± 0.25V/60mA Charging time: about 1.5H/charging current 50mA Sound prompt: English prompt Music duration: approximately 8-10 hours (70% volume) Talk time: approximately 7-9 hours (70% volume) Standby time: about 200 days (in the off state and without the earphones in the charging case) The built-in battery in the charging compartment is 400mAh, which can fully meet 2-3 times of fully charging the earphones Full charging time: approximately 1.5 hours Net weight of earphones: charging case+earphones 78g ± 1g (including lithium battery): Single earphone 8g ± 0.5g (including lithium battery)