Grandstream Networks WP820 - Table 4: WP820 Description; Figure 4: WP820 Description

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WP820 User Guide
Version 1.0.7.7
Figure 4: WP820 Description
The following table describes the WP820 keypad keys.
Table 4: WP820 Description
Key
Description
1.
Proximity sensor
The proximity senor can detect the presence of a human ear.
This sensing is done for two purposes: Reduce display power
consumption by turning off the LCD backlight and to avoid inadvertent
touches.
2.
Earphone
Delivers audio output.
3,4
Volume up / Down Keys
Configure the handset and ringtone volume.
5.
PTT Key
PTT (Push-to-Talk) button to initiate PTT call.
Note: PTT button can also be configured from Web GUI to have other
functions such as: SAFE/Panic Call & Mute/Unmute during calls.