This is an easy to install rv blue tooth camper leveling device. The module is powered by 3 aaa batteries and can be mounted in the cargo hold as long as the arrow faces the front of the camper. The app is easy to download and works very good. I did have an issue with connecting the modules bt to my phone though. It took me more than an hour to get this to communicate. After viewing the videos and making multiple attempts I finally got it to communicate by disconnecting it in the app, removing the modules batteries, reconnecting in the app and then installing the modules batteries. It then connected to it. After that issue the module began to work and is fairly fast to report the level stats to the phone. Now I just open the app and it connects. This level sensor also gives temperature data which is unique to this device. If this is placed in the cargo hold it will read the outside ambient temp. If placed inside the camper it will read the temperature inside the camper. Ill be placing this module where it will read the outside temperature so I can check the outside temperature before leaving the camper. If this module was water proofed it would be great placed on the campers front frame so the true ambient temp could be checked, but it's not water proof and can get damaged if placed outside the body. Most cargo holds are not climate controlled so the temperature will be close to outside temp.
As for the ease of app use when leveling the camper it's fast and works great so you can easily get it level setting in the drivers seat when positioning the camper. No more getting out to check the bubble levels.
This is an excellent leveling device for rv's and worth it's price.