You're asking about the ALM and SNZ functions on a SkyScan atomic clock. These are not typical functions found on atomic clocks. It seems likely you're referring to an alarm and snooze functions, which are common on many types of clocks, including some atomic clocks.

Here's how these functions usually work:

* ALM (Alarm): This function allows you to set a specific time for the clock to sound an alarm. You can typically adjust the time, the sound (if there are multiple options), and the duration of the alarm.

* SNZ (Snooze): This function allows you to temporarily silence the alarm for a set amount of time, usually 5-10 minutes. When the snooze time is up, the alarm will sound again.

However, it's important to note that not all atomic clocks have alarm and snooze functions. If you have a specific model of SkyScan atomic clock in mind, it's best to consult the user manual or product description to confirm the available features.

Here's what you can do to find more information about your SkyScan atomic clock:

1. Check the user manual: Look for the manual that came with your clock or search online for the specific model.

2. Look for online documentation: Search for the clock model name online and see if there are any product descriptions or user manuals available.

3. Contact the manufacturer: Reach out to SkyScan directly for support and clarification about the clock's features.

By providing more details about your specific SkyScan atomic clock, I might be able to offer more tailored assistance.