Panasonic EASA-PHONE KX-T2310 Operating Instructions Manual page 3

W One-Touch Tone Switching
lets you temporarily switch to tone from pulse mode by pressing a button.
W Electronic Hold
to hold your calling party --- can be released just by lifting the handset of
the unit or any extension.
W Timed Flash (700 ms) Memory
for automatic dialing and special telephone company services, such as call
waiting.
n 3-Step Ring-Volume Control
to set Off/Low/High ring-volume level.