Compatible with Critical XRR Power Supply, this wireless foot switch is made of an anodized aluminum case and has a non-slip rubber bottom to prevent slipping away while working. The centrally located touch switch, with mulitile contact springs, ensures a pleasant and fast response. The required energy is given to the foot pedal by two AAA batteries that are included. If they are empty at some point and you don't have one at hand, you can connect any commercial clip cord and work with them until you have new batteries available. Due to the built in technology, interference is almost impossible. This means no matter how many foot switches are used in a room at the same time, the signals will not overlap and there will be no undesirable interference due to the actuation of other pedals. A dust shield prevents dirt deposits inside the pedal and can be easily packed hygienically due to its size and shape.