I have this one and find it is more than ample sound and camera 😊 Plus, contact amazon, you may be able to get a refund/credit https://amzn.eu/d/effUVKz
We went with the owlet because you also get the sock which baby wears to monitor breathing / Sats etc. sound is good on the camera (better than the pic actually!)
I second the Cuboai! We love ours x
We have the CuboAi baby monitor! It works really well and you not only get notifications if they roll over, their face is covered, they cry etc but you get a sleep report. Plus it looks really cute. If you have any questions I'm happy to answer. I have a referral code for £15 off if you go ahead: https://uk.getcubo.com/?referer_id=seU0AWhkABj0