Pros:

• It is very small and handy.
  -The hardware wallet is immune to computer viruses or hackers.

• You private keys now will never be exposed in any computer
• It helps you to keep your crypto safe in your hand.
  You can now carry your BTC and ETH everywhere
• The backup stored in SD card so it is in a safe and secure place
• No need to worry your online wallets

Cons:

• Hardware wallets not free

• Most of the wallet online is free.