How do I know when the Dual USB Wall Charger is charging my devices? August 14, 2018 00:36 The charging indicator on your device will let you know when charging begins. Related articles When plugged into an outlet, will the Dual USB Wall Charger consumer power? Is the USB Dual Wall Charger capable of powering my laptop at a fast-charging speed? Where are Nimble products manufactured? Comments 0 comments Please sign in to leave a comment.