This FiiO E07K Andes digital amplifier is a versatile piece of equipment that can amplify audio from various sources. With USB and 3.5mm inputs, it is compatible with a wide range of devices, and its dual headphone jacks allow for easy sharing of audio content. The blue light indicator is a helpful feature that lets you know when the device is on and functioning properly. This amplifier is made by FiiO, a trusted brand in the audio industry.