Tenlox LED Light Up Dog Collar with Scrolling Display - USB Rechargeable Safety Collar for Night Walking, Jogging & Outdoor Adventures (Fits Small Medium Large Dogs)

App does not work particularly well IMOWants too much access to your phone - and even then it did not work wellChoosing Fonts is not greatscreen is just a little too smallMuch of the stuff in the app does not work with this device - like playlistsBluetooth is unsecure so anyone with the app can connect to it and send messagesThis is a cool collar because I can customize it and put my own message to display and it has different effects…. One thing that I didn’t really like is how big the on/off button is but that’s my oneness preference. Some people might not mindWhy does it use micro USB when USB C has been out forever? Also I didn't have problems with the App but I fear for those who may be technologically challenged. Otherwise it's a great collar, surprisingly clear in daylight.I was impressed by this collar! The LED panel is large and easy to read. You can animate the lights to scroll or have special effects to fade in which is pretty cool. It is fairly large and probably would not fit a dog smaller than 40 lbs. The app used to control the LEDs is not the best but it works and if you aren't changing the text frequently it's not a big deal. The collar charges pretty quickly. People loved the collar and were super impressed by the scrolling text! It would be perfect for adoption events where you can say "adopt me" or for nervous dogs where you could have it say "nervous" or "don't pet" since it is so visible. Considering you can spend $20 on non-LED collars or collars for nighttime safety that just simply light up this was a great buy at $25.Worked great for a while. Really like the way it looked. The letters were bright and easily visible. Programming is a little user unfriendly but figured it out (enough to do what I wanted). Popular at the dog park. HOWEVER, It did not last long. IT CANNOT TAKE MOISTURE~!~~!. The mini USB port for comm and charging corroded away FAST. Nor can it take much use. The other one had three of the wires break off from the battery controller rendering it useless. The mini-USB on it was corroding as well.The wires broke in less than 2weeks of use! It's a fun idea, but it's a piece of junk.The screen started glitching before i could even put in on my dog. I bought it because I thought it would be fun to make it say silly stuff but the joke was on me... waste of money.