The HF Signals website makes it clear that there is no specific warranty for their µBitx and Bitx40 products:

“The HF Signals kits are supplied as-is without any promise that they will work to any particular specification. That said, thousands of BITX transceivers supplied by HF Signals work across the world. There is an active and very informative forum for learning and getting help that is entirely driven by the builder community. Join us on https://groups.io/g/bitx20

“For queries about your specific order, shipping, etc., you can write to us on our gmail address (the userid is hfsignals). We can only respond to specific questions about your order, so remember to include your order ID from paypal.”