Works with LiftMaster 8355 and corresponding Chamberlain models
920860
Works with LiftMaster 8355 with MyQ and Security+2.0
My installer told me this keypad (which worked great with my ancient, but now dead, genie opener) would not work with these newer model LiftMaster (made by Chamberlain) garage door openers, but the user manual for the Klik2U said it was compatible with LiftMaster/Chamberlain units with the yellow Learn button. My LiftMaster 8355 has a  yellow learn button and sure enough, it works!
Follow the instructions for "type 4" and use ID 8 as indicated. My first try failed (not sure why, but i think i did not hold the Klik2U close enough (within 2 feet) of the unit during the 'learn mode' steps), but the 2nd attempts succeeded.
(Note that I am not using the MyQ (wifi and smartphone app)  features, but I assume it will not cause problems with my Klik2U keypad.)
Highly recommended.
4655729
Works great for my old Legacy Overhead door receiver (696) - wasn't sure it would and the instructions didn't explicitly list it as one of the supported models. But after 6 clicks it sync'ed with the opener and that's the end of the story.  Operates with an included coin cell battery - which is nice compared to the original remote I had which had a very obscure and hard to find battery.
2969233
I have an old Liftmaster garage door opener that was not on the compatibility list for this keypad. I called the customer support number from the Liftmaster.com website. The support person confirmed that the keypad would work, explained how to program it, and then emailed the instructions to me. Great experience and the keypad is working like a charm!
175789
The liftMaster 855lm Homelink Repeater Kit works great with our Homelink on our new Honda Pilot and our older Chamberlain door opener.
I added a little more wire on the antenna to get a little more range.  The only thing I have to say about it is you have to hold the botton in the Honda
for awhile before it opens the garage door. Lot better then not working at all.
The LiftMaster 855lm Homelink Repeater Kit works with both LiftMaster and Chamberlain openers.
1666912
Couldn't find compatible units for my 1989 vintage Chamberlain opener at Lowe's or Home depot.......some units for sale say they are compatible with all "brands" but, as it turns out, not all models.  Bought two.  They set up in about 5 minutes and both work fine.  Could be happier unless they had been free.
1304421
Works really great and not that hard to install, you just need to know what Liftmaster model you're syncing it to. The only drawbacks verses the old one is that there no enter button and the cover is not hinged and slides off too easily when accessing the button panel.
4555092
The title says it all. This remote control works well with my LiftMaster garage door opener that has a ORANGE button. Takes a few seconds to program - just follow the instruction.
2132427
Sometimes, ignorance is truly bliss, that and blind luck.

Our house was built in 1994, the original openers are still in use, it's a 3 car garage with 2 doors.

I've been wanting to be able to remotely monitor my garage doors, with kids and dogs, it's good to know the doors' status. I didn't read the fine print about these wall controllers only working with 1998+ Liftmaster openers, oops.

So, I blindly ordered the 888LM and the 828 gateway. It arrived magically in a couple days and within 20 minutes, I had it installed. One thing I didn't know, you have to let the wall remote charge a few minutes before attempting to use. In other words, read the manual.

After that, bingo, the wall remote worked, so I installed the 828 gateway and in a few minutes, yeehah, I could control and see my door via iPhone!

So, on to the next door, the single car door. Nothing worked. The slow blinking red/yellow on the wall remote, as indicated by the manual, told me my opener wasn't compatible with the 888LM, WTH, it worked with the other opener. I called support, they were very helpful and after I provided my opener model number, 1260LM, was told it's pre-1998 (1994 in fact) and not supported. So, they were quite surprised that it was working at all on the other remote.

So, a few beers later, I had a revelation....

A few months ago, during our bitter, never-ending winter, the opener for the 2 car door stopped receiving transmissions from the wireless remote. It would work from the hard-wired remote, but the wireless ones no longer worked. The 1 car door garage was still working.

After some amazonian searches, I discovered the likely problem, the circuit board on the opener was dead. So, I ordered Liftmaster Circuit Board Model 41A4252-6D (Non Security+) and replaced that in a few minutes, voila, problem solved.

Therefore, the "new" circuit board makes the 1994 Liftmaster opener work with the 888LM wall unit and 828 gateway! So, for about $65 you can upgrade your old LM opener and bring it into the internet era, very cool. I've since ordered another ckt board for the other opener and will be installing, soon and hopefully, it'll work with the 888 just like the other one.

I even called LM to let them know about this, after my initial call. Who knows if they'll pass that along but, now you know!
4239817
I have a Chamberlain LiftMaster so I naturally expected the programming to be easy. Based on the instructions, since I had a green programming button on the opener itself, I knew I needed to press the button four times. I programmed the remote standing under the opener and after I pressed the button on the remote the required number of times (4), I heard the opener click. I then pressed the programming button on the remote, then the big button on the remote and it opened. I walked over to the second opener and programmed it in less than 10 seconds. It took longer to open the package and read a few steps than actually program it. Outstanding! I will say that it was not obvious that the first press of the big button (the I or II button counts as one of the clicks. But again, listen to the opener and it will tell you when it is ready.
2303540
Worked well with my Chamberlain opener. Added it for my second button at the other end of the garage. Works well with the newer systems that my old door bell button would not work with.
3372984
I ordered the universal (with power outlet) but installed directly to Liftmaster opener just as described for a Chamberlain model.  It installed easily in 10 min, most of which is securing unit and the wire to the ceiling.  The plastic base is 4 or 5 inches around and is hung with a single screw. When installed directly to the opener, it works by detecting the senor at the base of the door being tripped and emitting a pulsing laser that can be seen on the dash on the car being parked. It will stay on for 30 sec or so and then turn off.

Some other reviews complained of the laser not being bright enough.  I have not had this issue yet but have not needed to use it with sun shining directly into the garage.  If you have an enclosed garage I can't imagine enough light coming through a window or open door that would prevent the laser from being seen.
1713172
This single button remote was operational in less than 30 seconds:
1) Compatible with our Chamberlain Lift Master Professional 1/2 HP machine
2) Pressed the "train" button on the machine
3) Kept the single button on remote pressed until light on garage door opener blinked
4) Done
416452
Perfect replacement for my old Sears model 139.53627SRT garage door opener. Had to remove logic board and remount it on the old plastic end panel as the one included did not have the same mounting spots but board functioned perfectly. The only issue was "lock" function on control pad didn't work but not something that I use often.  A good low cost and time saving alternative to installing an entire new system.
4721532
It took me about 45 minutes to set this up with my mid-80's Chamberlain opener.  The instructions say it's not to be used with pre-1993 openers that don't have the safety-eye feature, but I assume that's just for liability reasons.  It took so long to setup because my Chamberlain receiver had a 3 position DIP switch (+,- and 0) while the Clicker had a 2 position DIP switch so I first had to re-set the switches on the receiver so that none of them were at the "0" setting.  After that, it was a snap.
3889281
My unit is OLD. It has whisper drive written along the side of it in a 80s cursive writing. I was worried it was too old to get a replacement opener. My old remote said "lift master" on it. I have the red/orange learn button on my unit. This worked great and was easy to activate!
3693121
We have three garage doors. One is newer than the others so finding an opener that works with all three doors took a little research and a couple of tries. The Liftmaster 890max works with all three doors. The only reason I gave it 4 stars was that the instructions for programing it were different depending on the color of the learn button on the garage door motor. When I followed the instructions, it  didn't work for the older motors. I tried programing the Liftmaster for them just like I did for the newer door and it worked perfectly. Bottom line, the opener was perfect but the instructions need some work.
4090942
Works perfect with my Liftmaster door opener. Very easy to pair-up. Nice, solid unit with buttons that illuminate as needed.