The RFRTFTemp101A-1 is a battery powered precision temperature recorder and wireless temperature transmitter with its own internal memory. As a part of the Therm.A.lert System, this all-in-one compact, portable device will measure, record and transmit temperature readings at a user-defined interval. The RFRTDTemp101A-1 includes a precision RTD temperature probe mounted in a miniature bottle filled with a ethylene glycol solution. This provides temperature "buffered" readings which helps to eliminate false alarms. Each transmitter can be supplied with a serial-numbered, NIST traceable certificate at an additional cost. Note: Approved for use in the US and Canada only. External Temperature Sensor: External RTD 2,3 or 4 wire 100 ohms pt RTD External Temperature Range: -50~+80°C External Temperature Resolution: 0.01°C External Temperature Calibrated Accuracy: ±0.5°C (over 100°C span) ±0.9°F (over 180°F span) Memory: 5,461 readings Sample Rate: 1 reading every 30 seconds to 1 every 12 hours 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: 17oz.