Wireless signal from weatherproof remote sensor broadcasts temperature measurements up to 100 feet in an open area. A total of three modules may be used with the main receiver. Each module is supplied with an internal and external sensor. External sensor can be used under water and is supplier with a 10 ft. Cable. Indoor receiver can be switched from °F to °C, outdoor module only reads in C. The receiver displays data from all three transmitting modules on temperature trends, min/max memory and has a alarm function. The modules only displays in °C. Supplied with Velcro and bracket for wall mounting or has a Flip-out stand for tabletop use. Read up to three separate modules, 100 feet away, without any cables transmitting modules have a remote probe for the ability to measure air, liquid, or solids monitors temperature continuously – date is transmitted every 30 seconds nist-traceable certificate included