The Pololu 4-Channel RC Servo Multiplexer is an I/O expansion device that allows up to four hobby servos to be controlled independently or simultaneously from a single RC receiver channel. It can be used with RC receivers, Arduino microcontrollers, or other systems that provide a pulse-width modulation (PWM) output signal. It features a polarity-protection, reverse-voltage protection, and over-current protection. It also includes two LEDs for visual feedback and comes with a 3-pin connection cable for easy connection to any servo. With this device, complex servo sequencing can be achieved, saving weight and space when multiple servos are used in a single control project.