IMS-4210-E-NIST Wireless External Temperature Sensor for Ultra Low Temperatures The IMS-4210-E-NIST Wireless External Temperature Sensor monitors remote temperatures in freezers, refrigerators, etc. monitoring without running wires. The sensor's external probe has 12 feet of wire. The IMS-4210-E-NIST wireless node uses an integrated 2.4GHz wireless radio to receive temperature data from the sensor. Indoor range is 250 feet. With line-of-site, the IMS-4210-NIST works at even greater distances. The IMS series of wireless sensors has mesh networking technology so each sensor can be used as a wireless sensor/router or as a low-power battery operated sensor. When the IMS-4210-E-NIST is used as a router, greater distances can be realized each sensor/router adds another 250 feet of range to the system. The sensor includes 3 AA alkaline batteries for powering the sensor for up to 2 years end device mode . An optional plug-in power supply is also available then batteries function as backup power if main AC power fails. IMS-4210-E-NIST Wireless External Temperature Sensor Specifications Product # IMS-4210-E Operating Temperature Range 32 degrees to 122 degreesF 0 degrees to 50 degreesC Monitoring Temperature Range 109 degrees to 115 degreesF 85 degrees to 57 degreesC Operating Humidity 5-90% RH Sensor type 2.8K Thermistor Accuracy /- 1.8 degreesF 1.0 degreesC Power Requirements 3 AA Batteries / 5VDC Power Supply Router Mode Wireless Technology ISM 2.4GHz, 100 mW 20dBm Housing White plastic Dimension/Size 6.8 in. x 3.5 in. x 1.5 in. Compatibility IMS-4000 Wireless Receiver Node IMS-4200. Meets NIST or National Institute of Standards Technology Package Contents x1 Wireless Temperature Sensor x1 External temperature probe x3 AA Alkaline batteries x2 Plastic drywall anchors x2 #6 Metal tapping screws This item ships from a separate warehouse and may require extra time for delivery.