Keypad Lock; Backlighting; Voice Enhancer (Eql) Setting - Uniden UH810S-2 Owner's Manual

Operation

Keypad Lock

To prevent accidental entries, you can lock the keypad.
Press and hold [S] repeatedly to cycle through the Smart Key modes
until the appears.
To unlock the keypad, press and hold [S] again for 1.5 seconds.
The disappears.
When the keypad Lock is active, an error tone will be heard
if you attempt to press any key, except for the following key
function; (PTT).
NOTE
Back Lighting
The Liquid Crystal Display (LCD) is backlit for easy viewing at night or in
low light situations. The back lighting automatically switches ON every time
a key (except PTT) is pressed. It turns OFF 5 seconds after the last key
is pressed.

Voice Enhancer (EQL) Setting

Choose from 4 different receive audio level settings to provide a natural
Voice Enhancer for super clarity and performance.
Press [S], when in Smart key EQL mode, to change the setting between;
Off(Normal) /L1(Bass) /L2(Midrange) /L3(High)
UNIDEN UH810S/UH820S
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Handheld UHF-CB Transceiver