Works with Alexa for voice control hub required Alexa device and hub sold separately. Alexa can also provide notifications when your battery is running low so you can proactively replace them. Set up smart reorders through dash replenishment to make sure you always have replacement batteries when you need them. Simply speak to lock your door. Tell Alexa Siri or the Google Assistant to control your August Smart Lock Pro requires August Connect Wi-Fi Bridge. Control access for anyone. Grant access for a few weeks a few hours or a few minutes. It's up to you. Be sure you're secure in Door Sense. Only August has Door Sense to tell you if your door is securely closed and locked. Always know who is coming and going. Track activity at your doorstep with a 24/7 activity feed. August works with most single-cylinder deadbolts but not mortise rim cylinder or interconnected locks Keep your existing lock and keys. Easily attaches to your existing deadbolt Use your existing keys at any time. Locks automatically behind you and unlocks as you approach. The August Smart Lock uses Bluetooth Energy BLE technology encryption as well as an additional encryption mode. Simple DIY installation. Install in about 10 minutes with just a screwdriver. Certified Z-Wave Plus home product. Works with Z-Wave the leading wireless technology for security and home control products.