1. With the function of measuring active energy, no need to calibrate within its service life. 2. The usage of encryption techniques, one meter with one card, with good security and reliability. 3. Purchasing electricity first, and then consuming, establishing two levels of alarm system inside, automatically stopping power supply after the amount of electricity is over. 4. When user card is ed, the electronic meter can write information the card, with the software of sale electricity management system, user can learn more information about the meter. 5. After power off, the data inside the meter can be reserved for more than 10 years. 6. Large capacity magnetic latching relay, low power loss and high stability. 7. ing the user card, the energy meter can display the current energy quantity, accumulated quantity. 8. With the function of anti- steal- electricity. 9. Range of LCD display Surplus quantity 0 - 999999kw. H Accumulated quantity 0 - 999999kw. H 10. Special electrostatic-proof function in the IC card interface can stand 8KV electrostatic attack. Accuracy Class: 1.0, 2.0 Rated Voltage (V): 220 Basic Current (A): 5(20), 5(30), 10(40)