Viper Mini SE dongle lost

Unfortunately, you can't use the Razer HyperPolling Wireless Dongle to connect your Viper Mini SE. Even though it looks similar, the dongle is specifically paired to the Viper Mini SE and cannot be re-paired with another dongle, even one from Razer, The mouse and dongle are factory-bound, and Razer Synapse won’t detect the mouse with a different dongle.

Your Best Options- Buy a used Viper Mini SE dongle from eBay or a trusted reseller. Just make sure it’s specifically from a Viper Mini SE—other Razer dongles won’t work.

Contact Razer Support directly. Some users have had success getting a replacement dongle by providing proof of purchase and device details via Razer’s support page.

Just to clarify, if I’ve lost the dongle that came with my Razer Viper Mini SE and I purchase an another functioning Razer Viper Mini SE dongle, I should be able to pair my Razer Viper Mini SE with it, correct?  
 

Since you were saying the two were bound together at the factory, I wanted to make sure I would be able to pair it with the replacement dongle myself without needing to send something back to Razer.

If you’ll find Viper Mini SE dongle, then yes - just download the pairing utility tool and bind the dongle with your mouse: https://mysupport.razer.com/app/answers/detail/a_id/4868/