Although there is a power adaptor provided with your Kwilt device, you can also use any micro USB power adaptor with the following output specifications: 5V, minimum 2AMP and maximum 2.5 AMP. If you are using the Kwilt Shoebox Plus, we recommend using the power supply included with your device as the Plus model requires more power than a normal micro USB power supply. Kwilt2 and Kwilt3 use a generic round power supply, which is provided with the Kwilt device.