Lark-Wi app for iPhone and iPad

Lark-Wi Smart Lock is designed for Your Smart Life.Convenience, security, control, and lifestyle – never worry about losing keys and get locked out anymore. With your smartphone, you can lock and unlock your door, create virtual keys or temporary key codes for your visitors, manage guest access, know when your dog sitter actually arrived, and a lot more. Regular keys also provided. 
The Lark-Wi Smart Lock fits US standard door frames and installs in minutes with a screwdriver. No handyman needed.