Pros:

• no need for bulky keys anymore with this fingerprint technology
• stores up to 4 users
• weather proof, no more worries getting it wet
• stainless steel shackle
• this item is built to last
• rechargeable lithium battery
• very long batter life, last up to one year!
  Cons:
• so far, none. 4 users is good enough for me. battery life is long lasting. its all good