* Simple erection. Because it transmits signals via LV power line, special line is not needed so as to save investment; * The expanding frequency carrier and power frequency modularized technique to realize power line carrier communication. It features high accuracy, high reliability and strong reading capability; * It has function of relaying for each other, relay depth class 2, ensure concentrator reading one meter data not more than 2 seconds, communication transmission distance up to 1.5Km form main power line; * Enable to store electric energy and realize meter reading at any pointed time; * External acquisition terminal can be mounted with different energy meter and assembled with the existing meter to save the user’s expenses. It has adaptability and expansibility; * The main station can communicate with the concentrator through telephone line, special exchanger can be adopted to realize the same function; * Real-time reading data. It also can be used to calculate line loss as evidence to against tamper, creepage and optimize power network. It also can judge power supply fault.