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# How to create custom labels for your 'Units' or 'Participants' using the 'Available By' feature

The Available By setting lets you customize how your product counts availability. Instead of using the default "Participants" or "Units" labels, you can create a custom name that better fits what you are selling.

### Choosing Between Participant and Unit

* **Participant:** Use this if you count the number of people (guests, passengers, riders) when determining availability.
* **Unit:** Use this if you count the number of items (kayaks, ATVs, surfboards, etc.) when determining availability.

|| Your choice between Participant and Unit affects which features are available for your product. For example, the Check-In feature and WaiverSign document linking are only compatible with participant-based products. If you are unsure which option to use, contact our Support team and we can help.

### Setting a Custom Label

After choosing Participant or Unit, you can set a custom label. For example, a zipline tour might label their participants as "Flyers." Your custom label will appear throughout the product creation process and on your published product.

![Screenshot showing a custom participant label of "Flyers" configured for a zipline product](https://storage.crisp.chat/users/helpdesk/website/534637e8c2641800/3b6f6318-4144-44f5-ab45-64e7e7_4kdwvu.png)