14 of 14 people found the following review helpful I took a chance on these locks to secure some interior doors and I am quite pleased with my purchase, September 8, 2016 By Amazon Customer – Verified Purchase(What’s this?) This review is from: EZlock ELC01 4-in-1 Electronic Keyless Backlit Keypad Door Lock, Unlock by Code, Card, Code+ Card, Mechanical Key (Electronics) Despite coming from a seller that I’ve never heard of, I took a chance on these locks to secure some interior doors and I am quite pleased with my purchase. All of the exterior and interior components of the lock, minus circuitry and wires, are metal and feel reassuringly solid and sturdy when handled. Batteries are not included and there are no spare parts, but all of the screws and hardware fit together well with no malformed angles or inexplicable variations in geometry – definitely a welcome departure from the IKEA furniture I had assembled earlier that day. The actual installation was fairly easy. The first lock will probably take 30+ minutes if you, like me, enjoy familiarizing yourself with what you are installing, but after that, subsequent lock mounting can easily be completed in less than 10-15 minutes. The instructions are passably translated into English from their original language, and I, personally, had no issues understanding anything, but be advised that there will be some grammatical mistakes and odd phrasing. Programming the lock after installation is also quite simple, especially since the included Mifare cards were already added to the locks memory and would open the door immediately after I put in the batteries. Speaking of these Mifare cards, there are two included with each lock, as well as two mechanical keys, however, I had no issue in programming the lock to accept other Mifare cards that we had lying around the office. All in all, I found myself spending around a minute to program each new user. All in all, if you can overlook the lack of a well known brand and native English instructions, I think you will be pleased with the features and construction of these locks. Their support staff seems eager to communicate and help, so much so that I have received no less than 3 emails since my purchase, promising their assistance in the event of any problems – so far I have had 4 locks installed for a little under a month at the time of writing (9/9/2016) and have had no problems. For the price and the quality, I have found few locks on Amazon that are comparable.