Your need to buy a USB adapter to use with the APP.
1.No lock hole design, it completely abandons the traditional key and lock, in the fully opened and closed by remote control, realized the real security.
2.Extended antenna, stronger signal, safer and more responsive.
3.Add USB external power source function. Make sure the lock works when battery (not included) was dead.
4.Three unlock modes optional: Remote control unlock, indoor button unlock,phone APP unlock.
5.Easy installation on all kind of doors, very convenient.
Lock size: 15.5 x 8 x 3.5cm
Controller size:6 x 3 x 1cm
1* Lock Body Holder
1* Lock Catch
4* Remote controller
1* Bag of Mounting Screws
1* USB Cable