Aside from the original battery cover there is also a small label close to the battery that has the PIN and tracker ID:
Alternatively, we can provide you with the pin if you send us your tracker id.
Here are two options how you can find the tracker ID.
(1) In the app if you go to "H2O-Pal Tracker" under the menu when it's not connected. (If you see more than 6 characters than its the last six).
If you haven't tried to pair with the tracker you can continue to the step where you'll also get to see its tracker ID.
Above the tracker id examples are: AAC180 and AED015. Yours will be different.
(2) You may be able to also find it in the iPhone Settings app. Just go to Settings -> Bluetooth -> Your H2O-Pal is listed under " My Devices" ... the 6 character ID will be part of the device name.