Like how you could hang around your neck. Then battery indicator is very good spot and the charger last for days. The silicon around the mod is nice if you drop it.
So far only used the one but it works great once it is heated, and it stays heated quite a while. I find it best to load the coil, then preheat counting to about 60 seconds, I then begin to lightly pull and get a nice thick smoke I can hold the button or release it depending on the amount of smoke I am getting and or can take! So if you want some heat and some big clouds I recommend these coils way over the one that comes with the unicorn device it just seems to heat better, longer, and more consistently. If you want to blow clouds with the device you have I recommend using it.