Enjoy the convenience of keyless entry with this smart lock. Coordinates with the August Home App for Android and i-OS devices App allows you to grant access to other users and offers a 24/7 activity tracker so you know who enters and exits your home Lock and unlock your door with your smartphone. Auto-lock and door-sense technology keeps you informed when your door is closed and locked. Compact design easily attaches to existing deadbolt so you can also still use your traditional keys. Sense sensor 4 AA batteries. Lock adapter. Mounting hardware 3.27"H x 7.72"W x 4.25"D. Weight: 0.87 lbs.