These Mahr MarConnect wireless SPC data receivers are built with a security layer between the transmitter and receiver to ensure valid connections. These receivers allow for many-to-one connections of tools to a single receiver. The E-stick receiver is used with tools that have SPC output while the i-stick receiver is for integrated wireless instruments. They have ANT+ technology for many-to-one connections and for secure and valid connections. Up to 32 tools can be connected.