... to analog line main board. 1. The 3 green LED DS1, DS2 and DS3 are to reflect the environmental ... clockwise can improve the sensitivity of test, now the green LED DS1, DS2, DS3 may twinkle; static adjustment can meet ... the required sensitivity of tag inspection, if all green LED DS1, DS2 and DS3 not twinkling (lighting), it means ... 3. TEC-506 eas bookstore security system,entrance security systems