Express XTRATM Numeric Pager  Features: XTRA Compact 20 numeric message slots Shows time of day and date Time and date stamping Built-in alarm clock  Programmable on/off 7 selectable musical alerts Locks important messages Selective erase/erase all Easy to read backlighting display Silent vibration, chirp, no alert Saves messages when off Protective holster with hinged belt clip Low battery alert Uses one AAA battery