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The IMS-4210-E Wireless External Temperature Sensor provides remote temperature monitoring without running wires. The sensor includes an external probe with 12' of wire and is intended for monitoring temperatures in refrigerator/freezers or other harsh environments. Temperature data is sent from the sensor to the IMS-4200 wireless node via an integrated 2.4 GHz wireless radio. The device can transmit its signal up to 250' indoors and even greater distances when it has line-of-site. The IMS series of wireless sensor also features mesh networking technology, which allows sensor to be used as either a wireless sensor/router or as a low-power battery operated sensor. When used as a router, greater distances can be realized because each sensor/router adds another 250' of range to the system.