SHNITPWRUniversal Power Supply Adjustable DC 24V 12V 9V 14V 19V 30V 36V AC Adapter Multi-Voltage 9V ~ 36V 3A 108W Power Adapter 100V~240V AC to DC Variable Power Converter 14 Tips 5.5x2.5mm

I've used this to test a few circuits and things I've made, but it outputs an accurate and stable voltage no matter what you set it to, which is its entire purpose in life. Takes a little bit of time to turn on, and the screen with flash several times after you unplug it, but I presume that's just the electronics inside charging up and discharging respectively. Overall, functions well.

There are any number of universal power adapters available online. In my opinion that's not exactly what this is, as the term is commonly used. It's more of an adjustable voltage supply to be used by someone who knows what they are doing. As an electrical engineer type I have seen and used many over the years, both to replace a lost supply temporarily or some sort of project or experimentation, often using a bench supply. You can buy "universal" supplies at big box stores to replace your laptop supply, etc. Most have a number of different types of power tips included and a switch selecting various common voltages. You can also normally select the tip polarity. But, this supply literally has it all.This is not a high power supply. In fact, at the rated 100 watts it might not power more power hungry laptops or other devices. That is not really what it is intended for, though as long as you set it up properly and remain within specs there is no reason why it can't be used for that purpose with care. If you are looking for a universal supply for your laptop I'd probably get one purpose made for your laptop's power and voltage requirements. I am amplifying this as it would be very easy to set the voltage incorrectly and do harm to your device. Why add this complexity?For those, like me, who have a need for a portable variable voltage supply this one literally has everything. It includes almost every imaginable tip and while it's extremely easy to switch polarity, it's impossible to accidentally do so. If the tip you need isn't there fabricating an adapter would be very easy. The voltage output is extremely easy to set and change. Also, this supply can be used on all worldwide voltage systems, if you are traveling.I'd rate this supply excellent. The only improvement I could suggest would be the addition of a nice soft carry bag, which I plan to get. This is a great device easily worthy of five stars.

This thing just appeals to the MacGyver in me. It's good to have around, just in case you need it in an emergency (misplaced charger, etc.). But it's really not a substitute for teaching your family NOT to lose those chargers and you can't just set it and forget it. You really need to know what you're doing or you could damage some equipment. Mixed emotions. It works good for what I want it to do, I guess.

The only real problem I have with this is how annoying it can be to get a specific voltage. Want 12v? You're probably going to get 12.1v. Then 11.9v. Then 13.2v. It's super touchy. You can get it where you want it with some fiddling, but it's going to be annoying.I do wish it went down a little further than 9v. I have a lot of 6v things that I could use this on. Oh well.I have an absurd number of cordless tools. They basically all have different chargers. Sometimes, I don't feel like looking for a certain charger, and that's where this tool comes in very handy. As long as the tool has the input voltage written on it somewhere, I can usually just set this up, find the correct adapter, and charge the tool with this. That's a lot nicer than keeping track of 392 different chargers.The voltage is fairly accurate. I hooked it up to my multimeter, and it is generally about .1v high. In other words, if you select 10v, you get 10.1v. That's not bad and generally shouldn't be a problem.It is a little weird to turn off. The display flickers on and off several times as the internal capacitors drain. I was able to watch that happen by leaving my multimeter hooked up. When it stops registering a voltage, the screen stops flickering.I haven't had any functionality issues with it, so I'm happy.

I love collecting and repairing old laptops, and this little guy helps me to power up those laptops that are missing a power supply. It gets the job done, and for the $27 they're asking a the time of this review, it is worth it to the vintage laptop collector.

I got this to help charge small lifepo4 batteries. It worked about 15 time and then burned out. I haven’t taken it apart yet but the fact it broke this early is concerning.

This gizmo will allow you to test and adjust a whole variety of electrical stuff. It's small and lightweight, so it can travel easily if needed and comes with a host of connectors as well. Good stuff.

I wad honestly scared to use this because I have used universal chargers before and they either break or short circuit. Some even short circuit the electronics. This one though seemed to work really well with my monitor just make sure you set the power to the voltage you system take, it will tell you in the back. If you put it to high it will ruin your system. I have used it so far for a lot of my electronics. One being my monitor and my nephews monitor. I love that when you finish using it you can turn it off.

Did not fit what I wanted it for LG Wireless Sound Bar