The RFTC4000A is a thermocouple based temperature data recorder with built-in, wireless (RF) transmitter. It can transmit data up to 120 feet, line of sight, when used with the RFC101A receiver. Built-in memory also stores data internally. Features a built-in temperature sensor for cold junction compensation (CJC). An external thermocouple probe is required (not included). Accepts J, K, T, E, R, S, B, and N type thermocouples. Note: Approved for use in the US and Canada only. Internal Temperature Sensor: Internal Semiconductor Internal Temperature Range: -30~+70°C Ambient Internal Temperature Resolution: 0.1°C Internal Temperature Calibrated Accuracy: ±0.5°C External Temperature Sensor: External Thermocouple External Temperature Range: -270~+1370°C probe dependent External Temperature Resolution: 0.1°C External Temperature Calibrated Accuracy: ±0.5°C Memory: 4,095 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.