SkyScan 81690 - Main Unit Button Operations; Alarm and Snooze Functionality; Time and Channel Navigation; Snooze and Signal Reception Control

1. ALARM ON:
 Press it to turn the alarm and snooze on or off.
 In normal time mode, press and hold it for 2 seconds to enter the alarm and pre-alarm
setting mode.
2. TIME:
 Press it once to view the Dew Point.
 Press and hold it for 2 seconds to enter the time setting mode.
3. UP:
 In normal time mode, press it to choose between channel (1),(2) and (3).
 In setting mode, press it to increase the setting value.
4. SNOOZE:
 Press it to stop alarm when it is sounding.
 Press and hold it for up 8 seconds to stop current RC reception.