How can I take apart the handset to change the battery or microphone

Here’s the user manual on it but I don’t see a battery replacement:

http://phone.manualsonline.com/manuals/m...

See id this helps:

Volume

You may adjust the ringer, speaker, handset and headset volumes independently with

the VOLUME ^ and VOLUME v buttons. Your telephone comes with predetermined

settings which can be adjusted to individual taste. You will hear an error tone when

the maximum or minimum volume level is reached. During volume adjustment, a

"dashed line" icon shows in the display.

Press the VOLUME ^ or v button while in on-hook mode.

NOTE: To turn the ringer off, on, or change the ringing pattern, see

Selecting A Ringer Tone.

Adjusting the Handset Volume

Press the VOLUME ^ or v button while the handset is in conversation mode. You may

choose from four volume settings: LOW, MID1, MID2, and HIGH.

Adjusting the Speakerphone Volume

Press the VOLUME ^ or v button while in speakerphone mode (SPEAKER indicator is

on). You may choose from four volume settings: LOW, MID1, MID2, and HIGH