Using the AK Control app, you can connect smart devices and Astell&Kern products to check their status and set various usage environments. The AK Control app is free and compatible with most Android systems. (Android : 7.0 or newer) [Features Include] - Convenient user interface - Displays the product battery level - Ambient mode and ambient mode level control are supported. - Easy touch tap customization - Provide various EQ presets - Provide User EQ Setup - Voice prompt setup - Provide DAC filter setup - Provide USB Audio Class setup - Support for the latest software updates. [Caution] - Features supported may vary by product. [Device settings] The currently available device is AK UW100, AK UW100 MKII and AK HB1. Please pair it with AK UW100, AK UW100 MKII, AK HB1 in settings after install the AK Control APP. [Compatible model] - AK Control currently supports AK UW100, AK UW100 MKII, and AK HB1.