IMS-4211 Wireless Humidity Sensor Also Works as Router IMS-4211 Wireless Humidity Sensor needs no wires to remotely monitor humidity. An integrated 2.4GHz wireless radio transmits data from sensor toIMS-4200 Wireless Node Purchase Separately . Normal indoor transmission signal range is 250 feet. Maximum range is further stretched when device has line-of-site. Mesh networking technology in IMS-4311 wireless sensors allows each sensor to be used as an end device, either as a wireless sensor/router or as a low-power battery operated sensor. Optional plug-in power supply allows batteries to provide backup power if main AC power is not available. However, when the IMS-4211 is used as a router, AC power supply, not just the back-up battery power, is required. This kit includes one unit IMS-4211 Humidity Sensor cased in white plastic, two 2 plastic drywall anchors, and two 2 #6 Metal tapping screws to be used for mounting the device. IMS-4211 Wireless Humidity Sensor Specifications Operating Temperature Range 32 degrees to 95 degreesF 0 degrees to 50 degreesC Operating Humidity Range 0-95% RHSensor type Solid state icAccuracy /- 3%Power Requirements 3 AA Batteries / 5VDC Power Supply Router Mode Wireless Technology ISM 2.4GHz, 100 mW 20dBm Housing White plastic Size/Dimension 6.8in. x 3.5in. x 1.5in. Compatibility IMS-4200 Wireless Node Package Contents x1 Humidity sensor x2 Plastic drywall anchors x2 #6 Metal tapping screws This item ships from a separate warehouse and may require extra time for delivery.