version="1.0" standalone="yes"? What is IR controller? The IR controller is designed to wirelessly control robots and other mechanical device. Working with many common IR receiver, this IR controller provides you a simple and easy way to control your devices without touching it! (Picture for reference only. please go through part list before purchasing.) Feature Integration ? Compatible with Makeblock robots and software; ? Aim the IR controller at the IR receiver from a short distance; ? Works with the NEC IR protocol. Various Buttons This IR controller comes with 21 buttons, including buttons labeled from letter "A" to "F", number buttons started from 0 to 9, and four direction buttons. These buttons allow you to control your robot in a more precise way. About Battery This IR controller does NOT include a coin cell battery. We recommend that you use a CR2025 coin cell battery to get this IR controller work.