It’s surprising how many enquires we get asking for small beacons that also have a long battery life and long range. Such things don’t exist. The range and battery life relate to the battery size. Both need a larger battery and hence this implies a larger beacon.
You need to choose what’s most important for your project. If you need a very small device then the iB001M is only 2.6mm thick but has a small CR2016 battery. If battery life and range are more important then look at the larger battery beacons and long range beacons. If you have the possibility of mains (USB) power then you might consider a USB beacon that can be small.