Vax 17RTC - Manual (Page 27)

5. Key Lock
Press the up(▲) / down(▼) button to select the key lock menu.
Press the right(▶) or ENTER button
Press the up(▲) / down(▼) button to select on or off
Press the MENU button to save.
INSTRUCTION MANUAL ……………………………………………………………………………… 26