The 912-M base probe for the iManifold™ is used to measure line or air temperature with up to (2) plug-in thermistor temperature probes (not included).The base probe can also function as a ZigBee repeater to increase the overall transmission distance of other wireless probes or accessories in the iManifold System. The 912-M has a magnetic base to hold it in place while the measurement is being made. The probe cannot be used without the iManifold™ (or iConnect™)as the iManifold™ /iConnect™ is the communications hub for interfacing with the smart device application. A maximum of (12) probes can be connected. Includes (2) AAA batteries or can be powered by user supplied micro USB power supply.