Radiacode ZERO has an intuitive menu system and is operated using three buttons. Audible and vibration feedback assist in operation. Which rocker button is "up" and which is "down" depends on the screen orientation setting.

The device in the left hand and in the right hand:

1. Power/confirm button, round.

2. "Down" rocker button.

3. "Up" rocker button.

Two types of button presses: short and long (at least 3 seconds).

A long press of the round button [1] is used for: powering on, unlocking/locking the rocker buttons, confirming the alarm summary review, and certain settings screens.

A short press of the round button is used for: calling the menu, returning from the menu, confirming a selection, cycling through options, and dismissing alarms.

The rocker buttons auto-lock after 5, 10, 15, or 30 seconds of inactivity. With backlight duration set to 2 or 5 minutes, the rocker buttons lock after 30 seconds of inactivity. Unlock by long-pressing the round button. In Auto backlight mode, the backlight will not turn on in bright light. Lock again with a short press of the round button.

A short press of the rocker buttons [2, 3] is used for: navigating between menu items, setting numeric values, and additional options in various modes.

A long press of the rocker buttons [2, 3] serves different purposes in different contexts. In menus, a long press causes rapid scrolling through items. In display modes, a long press of the "up" rocker button toggles the audible indication on and off.

When navigating any menu level, the selected item is displayed in inverse — light on a dark background.

Every button press is accompanied by a short sound and vibration (if enabled). Button press sound and vibration can be disabled.