ActionFitBluetooth® sports headphones

What are the differences between Bluetooth versions?

Is my Philips headset compatible with an iPhone?

Should the Bluetooth version of my Philips headset and my phone match?

Can someone else hear my conversation via Philips BT headphones?

Can I use the Philips headphone for voice calls via PC?

The volume of my Philips in-ear headphones is too low