Aimpire Acoustic Guitar Amplifier, Black (NX4) Universal CompatibilityTOPPING NX4 DSD can Remarkably Compatible with a Various of Digital Devices. It is an excellent pairing for laptops and smartphones. For Easy UseWhen youre on the go, the TOPPING NX4 DSD comes with rubber bands and Velcro feet to attach to your smartphone or digital music player when youre on the go. Nice Balanced PresentationTOPPING NX4 DSD handles complex orchestral music very well Easy to CarryFeaturing a full aluminum shell, the device itself is surprisingly small and light Complete AttachmentTOPPING NX4 DSD includes printing on the outside which lists all of the device specifications.