Many users in our forum previously mentioned that they’d love to have backup batteries included—and now it’s here!
The Smart Lock U400 Deluxe Kit is officially available on the Apple Online Store, and this version includes 2 rechargeable batteries in the box. One for daily use, one as a backup, so you’re always prepared.
Available now on the Apple Online Store.
Love it!!!
The metal surface is really awesome! Please release similar for us for Europe 
Which one is satin nickel??? Silver, or black?
Two rechargeable batteries, enough said!
Have been trying to get 2 more of the deluxe satin nickel ones from the Apple Store. Has not been available for many weeks! Still not able to place an order or even a back order.
It looks great.
If you’re still trying to get one, check Samsung’s website. I just ordered one in Satin Nickel.