If you're worried about your kids listening to high volumes on their headphones, a good pair of BuddyPhones+ can provide the volume control they need. And your littles will love customizing them with stickers!
If you're looking for a dedicated heart rate monitor that is comfortable to wear and is hyper-accurate, then you should consider the Scosche Rhythm+2.0 armband. It's a perfect complement for your workout routine.
The PowerA Fusion Pro Wireless Nintendo Switch Controller is a premium gamepad complete with removable back paddles. While it brings some new features to the table, it's also missing some of the basics.