Yale Security Assure Lock SL – Key-Free Touchscreen Door Lock in Satin Nickel; 3. However, it is expensive, so really only worth it if you have a room you want to "protect" or a vulnerable exterior door that doesn't have a deadbolt (such as a shed or internal garage door). For a retrofit installation all the equipment you should need is a Philips head screwdriver. As a standalone digital lever, there is no need for an additional deadbolt lock, nor a latch or a separate door handle. Pick out the look that matches your door and house style. This smart lock goes on any standard door that doesn’t have a deadbolt. Yale Assure Smart Lock with Lever $179 $179.00 + 9 Deal Score. There is also a Z-Wave Plus module you can use instead of the August Connect – which makes the lock compatible with Z-Wave smart home systems, including SmartThings and Ring (and its Ring Alarm system). When you buy through links on our site, we may earn an affiliate commission. The company says the Yale Assure Lever Lock can support 1 master key. At Postscapes we combine our years of experience following the smart home market along with user reviews to take the guesswork out of living securely connected.