Ok so I absolutely LOVE this little gadget I found at Bed Bath & Beyond at the check out counter. It’s called mybaby and it was about $10. It plays four different sounds; a lullaby, heart beat, waves crashing & white noise and it has volume control which gets pretty loud. My little girl loves it! She calms right down when I turn it on. It has a hook to clip to anything. Right now I just leave it on her car seat (I should have bought two!). It has speakers on both sides so if it flips over, no worries! The music can still be heard.