The RFRHTemp101A is a temperature and humidity data recorder with built-in, wireless (RF) transmitter. Using the RFC101A receiver, this data recorder can transmit data up to 120 feet, line of sight. Built-in memory also stores data internally. Note: Approved for use in the US and Canada only. Internal Temperature Sensor: Internal Semiconductor Internal Temperature Range: -30~+70°C Internal Temperature Resolution: 0.1°C Internal Temperature Calibrated Accuracy: ±0.5°C RH Measurement Range: 0~95%RH RH Resolution: 0.5%RH RH Calibrated Accuracy: ±3%RH Memory: 5,461 readings per channel Sample Rate: 30 seconds up to 12 hours LED Indicator: Red & Green Required Interface Package: RFC101A PC Baud Rate: 57,600 RF Carrier Frequency: 418 ±0.075MHz RF Baud Rate: 4800 Output Power: <0dBm typical (<1mW) Receiver Sensitivity (RFC101A): -90dBm typical Typical outdoors/line of sight: Up to 120' (36m) Typical indoors/urban line of sight: Up to 40' (12m) Approvals: US(FCC), CA(IC) Typical Battery Life: 1 year Material: ABS plastic Operating Environment: -30~+70°C; 0~95%RH non-condensing Dimensions: 1.7" x 2.3" x 0.8" plus 2.0" antenna (44mm x 59mm x 21mm + 51mm antenna) Weight: 2oz.