APE6600:01.Without any host or control center, directly receive signals of pager. * 02.With manual/automatic power saving function. 03.Two prompt modes of vibration and music. * 04.LCD display with sleep function,effectively extending the standby time. * APE750: 01. Table-card type of five-button pager02. Stable login mode * 03. Anti-temperature and humidity changes04. The number can be changed optionally with strong re-use ability