To fully charge the device, plug the Color Muse 2 into any Micro-USB cable (one is provided within the Color Muse 2 package) for 60 minutes. For best results, plug the device into a wall outlet. The device will illuminate GREEN when plugged in. To conserve power, the lights will turn off once the device reaches full charge. You can also check the battery level in-app under “Menu” and select “Manage Device”. The battery is fully charged when the battery percentage shows 100%.