... the battery can continuously work more than 3 years. ♦ Display and surveillance 1. Large wide temperature (-30ºC--80 ... load, day hour, low load energy, etc. LCD display recycled. After energy meter connect electricity, date, time, current total, sharp, ... semiduplex , RS485 communication circuit is separated with inner meter circuit, communication distance:1200m. Electric parameter is conform to DL/T645- ...