AT&T E5804 - Manual (Page 6)

3
Getting started
Quick reference guide
Telephone base
HANDSET LOCATOR
Press to make handset beep (page 16).
VOICEMAIL
Flashes when there is new voicemail
(requires voicemail service from your
local telephone company).
CHARGE/IN USE
On when the cordless handset is properly positioned to
charge in the telephone base.
Flashes quickly while an incoming call is ringing.