What problem does this solve?
For example, a quick check of Walmart.com for store available baby monitors near my zipcode has the cheapest monitor at ~$35.00 and the rest at $80-100+. Because the $35.00 monitor is not available in stock at all the Walmarts near my zipcode, distribution and segmentation mean new parents not enjoying the benefits of relatively lavish baby showers and other gifts face a substantial consumer purchase...more than 10 hours at minimum wage.
As described, a minimum viable Hablo probably might require <$5.00 of hardware...microphone, power supply, and wireless. So I'd say there might be an underserved market in the US. Outside the US, I'd expect the same.
This is of course a possible problem that might be solved. With the caveat that the shape of the baby monitor market might reflect absolute requirements for profitability...but I think that's more first world economic theory than reality on the ground.
I think deaf parents might be a better angle to take with this product, as it could give a non-auditory cue back to those parents.
I also appreciate that neither monitor relies on my Wi-Fi network working.
Please keep in mind that I described a feasible answer to "what problem does it solve?" That doesn't mean the OP's business is viable or likely to experience hockey stick growth. It's just that after a little reflection, I realized the basis for my initial dismissal was mostly "a $100 baby monitor isn't a big deal for most people I know well." They tend to have bank accounts and Visa cards and internet access.
They tend to be better off than many people I see in Walmart.