How do I identify an unknown Bluetooth device?

Can you help me understand how to identify an unknown Bluetooth device? I've noticed a few unfamiliar devices popping up on my list of available connections and I'm not sure if they're SAFE to connect to. What steps should I take to determine whether these devices are legitimate or potentially harmful? Is there a way to verify the identity of the device owner or check its security features before connecting? Additionally, what precautions should I take to protect my device and personal information while using Bluetooth connections?