Wireless AC Current Meters measure the RMS current of an alternating current (AC) system using a current transformer (CT) that wraps around the "hot" wire of a two wire (hot, common, ground (optional)) power system. The sensor reports Minimum RMS current, maximum RMS current, average RMS current, and amp hours to the monitoring panel. The system is capable of generating watt hour or kilowatt hour readings as well.
Absolute Max CT Current:  50 Amps RMS (Arms)
Maximum Accurate CT Current: 20 A rms
Frequency Measurement Range: 50 – 100 Hz
Accuracy: +/- 2% @ 2 to 20 Arms, +/- .07 Arms @ < 2 Arms
Calibrated Accuracy with Appropriate Offset: +/- 1% @ 2 to 20 Arms, +/- .035 Arms @ < 2 Arms
Offset Limits: -1.27 to + 1.27 Arms (default set to +.1 Arms)
Measurement Resolution: ~.01 Arms
Weight:  3.7 oz
Security: Encrypt-RF® (256-bit key exchange and AES-128 CTR)
Battery Type: 2 Replaceable AA 1.5 V Batteries
Dimension: 4.375 in x 2.470 in x 1.12 in
Supply Voltage: 2.0 - 3.8 V (2 x AA 1.5V Batteries or Optional Power Supply)
Battery Life: At 1-hour heartbeat setting, included AA batteries will typically last 6-8 Years. **
Max Operating Temperature Using AA Alkaline: -18°C to 55°C (0°F to 130°F)
Max Operating Temperature Using AA Lithium: -40°C to 60°C (-40°F to 140°F)
Optimal Battery Operating Temperature: +10°C to +50°C (+50°F to +122°F)
Enclosure Material:  ABS
Operating Frequency: 900 MHz Operating Frequency
Certifications: Complies with Part 15 of the FCC Rules. (FCC ID: ZTL-G2SC1)
                      Complies with Industry Canada standards. (IC: 9794A-G2SC1)
Device Range:  Device Range Up to 1,200 ft. non-line-of-sight, wireless device range*
Security: 
Encrypt-RF® (Diffie-Hellman Key Exchange + AES-128 CBC)