This document describes a project to create an Android application that allows users to control an air conditioner remotely using their smartphone. The application would use Bluetooth to communicate with an Arduino board connected to an IR LED, which would send signals to the air conditioner to turn it on/off and adjust the temperature. The system has advantages like being more convenient and easy to use than a physical remote, but limitations include a shorter operating range due to using IR signals. The document outlines the hardware and software components used, including an Android app created with MIT App Inventor and programs uploaded to the Arduino board. It concludes the system could be applied to other remote-controlled devices and represents continued development of smartphone applications.