One of the biggest drawbacks of smart locks is that, unlike traditional locks, they’ll eventually run out of power, which means replacing or recharging their batteries at least once a year.
The best smart locks try to lengthen this time as much as possible, but the Lockin Veno Solar could eliminate that inconvenience entirely. It has a solar panel on the exterior portion that very slowly charges up the lock's battery, so that you never have to worry about recharging it or replacing the batteries.