Engadget readers can save $20 on August's fourth-generation smart lock

With its fourth-generation model, August has one of the best smart locks on the market. It's easy to install, works with most digital assistants and lets you keep using your existing mechanical locks. At $249 it is more expensive than some other smart locks, but starting today you can save $20 by using the code ENGADGETLOCK at checkout. That brings it down to $229, which is the cheapest price we've seen to date. August's latest smart lock is nearly half the size of previous models, comes in silver or black and is invisible from the exterior. It features door-sensing tech that informs you when your door is closed and locked, voice control via Alexa and the Google Assistant (via August Connect), an activity feed to track who comes and goes and the ability to automatically lock itself behind you.