美国采购需求：电子、照明

I'm reaching out regarding an issue I've encountered with one of the smart timer switches I purchased recently. I bought two units, and unfortunately, one of them has stopped functioning. I've attempted to reset the device multiple times, but without success. I'm looking for your guidance on how to proceed with this situation. Can you provide any troubleshooting steps or options for replacement? Your prompt assistance would be greatly appreciated, as I rely on these devices for my smart home setup. Thank you for your help!