SendersGSM Gate Opener,GSM Remote Switch,Door Opener with GSM Dial Control (RTU5024)

This is a great product. My tips:1. It doesn't work without setup; after the obvious wiring, go to page 5 of the manual and program the SIM number, then go to 5.3 Relay setting.2. It doesn't work the Three because of the G3 version being USA style. I used Tesco, O2 and Giffgaff all OK.3. It will not act on non-command incoming texts. This can be a pain if the Network wants you to respond to a text, (like Tesco does for Login). It would be nice if it would forward non-command texts to another mobile, or just be available to query.4. I loved the detachable connectors and good quality screw downs. The quality throughout is great.5, Its a bit funny the antenna is fixed at 90 degrees. The antenna needs to be vertical for UK GSM, means the label is read sideways.Anyway, buy it! Its easy to use and very functional.

Bought this in advance of our gates going in and set it up with a vodafone SIM.Pretty easy to set up, tested and worked fine on a +12v battery. Left it soak testing for 24 hours and all good, relay closes as expected.Fast forward two weeks and our gates are fitted. Connected this item up and expected it to work but as soon as I plugged it in it went POP.The Aux output for my gates is +24v and this item shows an operational range of 9-24v which is clearly misinformation as 24v destroyed this unit. I saw a flash from inside the unit and now its dead.I’m returning it and will get another but I’ll have to reduce the supply voltage to 12v which is a bit of a pain, especially when this unit should run on 24v as shown.

This little box is fantastic. Don't be put off by the low price, it does everything you need if you already have an automatic gate.The way it works is that you phone the number ("hey siri, phone gate") and it immediately hangs up on you and operates the relay for about 5 seconds. By default it will text you back a confirmation but you can disable this which means that it is never making any chargeable calls (so a PAYG SIM lasts longer). However eventually a PAYG SIM would be deactivated if you never made any chargeable calls but you can configure the device to send a status text message every 999 hours (roughly 45 days) and this is enough for the mobile operator to keep the SIM active.During the initial setup, it does text you back for every configuration change you make but I went for a Vodafone "max £1 per day" PAYG SIM and did all my configuration that day so it only used £1 of my topup credit. 3 years later I am still on my original £10 topup.I live in a weak signal area but, so far, it has worked without a problem.EDIT: Oct 2019. Its still working well and I have not had to top up the £10 I originally loaded onto the SIM.EDIT: Apr 2021 It's still going strong and still on my original £10 topup.

Used it to remotely open a gate via an SMS. Very easy to setup and works well. Used an ASDA sim card which you can top up for just a few pounds. I setup a shortcut on my iphone and when I say "open the gate" Siri sends a text to the gate. As you need to use the SIM once every six months to ensure it doesn't expire you can send a text to the device to enquiry on the status so the device will send you a text message (4p) with ASDA. Do this every 5 or so months and the SIM should never expire. There is also an ios App which makes it easy to setup. The instructions regarding this could have been easier to be honest but the App make it so easy. I just send 1234CC to the SIM to open the gate. The 1234 is the password (which can be changed) as no-one knows my SIM's phone number and I have set the unit to only recognise our phones I didn't need to change it. Great device and would recommend.

I bought 2 of these units. The one works very well and very reliable but the other is very hit and miss. Seems to work ok from text commands but is now not responding to phone calls. I will have to send the second unit back, but now out of the Amazon return window !Update. The second one has also stopped working now..... Cant get company to answer emails !I think I will spend a little more and get a reliable one/two...

This unit works well BUT - It only operates in 2G - It is NOT a 3G unit as per the title description. It operates on 850/900/1800/1900Mhz, which is fine for 2G but it does not work on 2100Mhz, which is 3G in the UK. As a result, it will not work with a "Three" SIM as Three does not operate a 2G system. It will work with a Talk Talk or O2 SIM as they both operate in the 2G band. So BUYER BEWARE - The description is incorrect (and reported to Amazon as such).

Small, compact and very easy to set-up.

Fantastic piece of kit. This is a dream device for me as it neatly fits into Airbnb self check-in solution. I use it to automatically buzz in guests to an apartment building. I give guests timed access all from my home. I have a ring intercom based backup solution but this has worked with no issues for a week now. Hardware looks solid but I can only hope it doesn't break. I will have to see how to integrate this with Nuki smart lock for fully automated end to end solution.