The Onkyo DapController is the official Onkyo remote control application that allows users to conveniently operate compatible Onkyo DAP products from their iPhone/iPod touch. The intuitive, user-friendly interface makes it easy to get more from your audio entertainment experience. This app has the usual remote control functions (play/stop, volume control, etc.) via Bluetooth® Low Energy. This APP allows you to operate the DAP in your pocket from an iPhone/iPod touch. Get more from your portable music entertainment experience with this app! Main functions that can be operated through this application 1)Play/Pause 2)Song Skip Up/Down 3)Volume adjustment 4)Extension Keyboard Compatible models (Models released in March 2017 or later) DP-S1 - Please note * Updating to at least iOS 8.0 is required to use Onkyo DapContoller. * Can not be used on iPad 2.