For the price these are great bits of kit - and you get 2 of them!Useful for people that like building stuff. Like I built a key-fob operated home door locking system, for a little extra security. I can bolt and unbolt the door inside - from outsideI notice people saying that the motor burns out. Well of course it will if you leave the power to it switched on constantly! Once the motor has driven the actuator fully, it cannot turn any more, so it will just heat up and eventually burn out! They are designed to be switched on for a brief period of about 250ms up to a second or two at most (at 12v) then you reverse the polarity to drive the actuator in the opposite direction for the same amount of time, when needed. You need to use 'momentary switches' (PTT) and/or relays to operate them properly.They say they can lift about 1kg. I haven't tested that, but it wouldn't surprise me. Certainly powerful enough for what they are designed for - car door locking.If you are into building R/C cars and stuff, these could be good to adapt for steering mechanisms and that sort of thing. I'm sure there's loads of stuff you could use them for, where you need a bit of electrical push or pull.Great fun, great price.

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I bought these as part of a domestic security system that I am designing. They are to be used as central locking devices for doors and gates. Some reviewers are complaining that they are burning out, however, I haven't had any problems burning out or them even getting mildly warm! To operate, they should only be subjected to momentary pulses of power. The best way to achieve this is with relays, with either built in timers, or as part of a circuit that includes some sort of micro controller, I'm using the latter, I have a system that uses Arduino Nano MCU's. I've established that they only require about 300 milliseconds of 12V DC supply to push or pull the rod. Once the action has been completed, the power can be removed, and they can sit in a state of 0V until the next time that they are required to do their job. Obviously, you have to reverse the polarity to make the rod move in the opposite direction as to it's previous direction. Best to use a DPDT relay, with a timer that operates in milliseconds. These are cheaper, more powerful and more reliable than the ordinary electromagnetic solenoids that you can buy on Amazon.

Funktioniert einwandfrei.

Product didn't work as suggested