IR Transmitter LEDs: Sends IR code to a device. IR Receiver: Receives IR code from a device for reading back parameters or determining the type of device that is being programmed. LCD screen: Backlit LCD screen with 4 lines of 20 characters. 5 levels of illumination. Keypad: Robust tactile keypad with a positive click. Ergonomically designed to be used with one hand. Alphanumeric keys for entering parameter levels and naming macros. USB port: Connection port for a USB flash drive / memory stick.