The rechargeable SHA900 works with your mobile device to enhance the experience of your favorite earphones and headphones. Offers 5 EQ presets, 4 customizable EQ settings, and Bypass Mode which bypasses digital processing for pure analog audio enjoyment. Features high-resolution 24/96 ADC/DAC, aligning with the Japan Audio Society High-Resolution requirements for both analog-to-digital and digital-to-analog conversion.Works with any earphones or headphones with a 3.5 mm jack; compatible with Mac, PC, iOS, and Android devices. Includes SHA900, micro-B-to-USB cable, Lightning® cable, two 3.5 mm cables, USB wall charger, 1/4 '' adapter, airline adapter, attenuator, polishing cloth, 2 security bands and user guide.