Key-less or remote access locks for multi-family units?

[Erik Hopperstad]

My partners and I are currently invested in multi-family properties in rural areas. We currently have onsite management that is overseen by our in-house property management company but we're looking for further efficiency. Is anyone aware of a key-less lock system that we can use on our properties? I'm asking specifically for each individual unit, not the main entrances. Ideally, we would be able to change the "code" or "key" remotely so we wouldn't have to physically visit the sites to accomplish this. Any info, suggestions or first hand experience would be greatly appreciated!