SLCSL charges the rear light before the first use. Tap the rear light and charge the following USB output devices. 1 notebook computer charging mode, 2 charging plug charging modes, portable power source mode charging. Note: The output voltage of the charger can not be higher than 5V. The green indicator flashes in the lampshade during charging. The green indicator in the lampshade is bright when fully charged. The one-time charging time of full power is 1 hour45 minutes. Power display function: 1. Power on situation: when the power is less than 20%, the green indicator light flashes quickly. Power off situation: easy click on the switch when the power is more than 70%, the green charging indicator lights up for 2 seconds. If the power is more than 20%, the green charging indicator will flash slowly for 2 seconds, if the power is less than 20%, the green charging indicator will flash quickly for 2 seconds.Make sure this fits by entering your model number.