Originally Posted by Speedy4x4

Yes, have to remove to add air to tire.
Also when battery is dead, you can change battery yourself. Instead of paying a shop.
Keep some spare batteries around, they are cheap if bought on ebay, $2 apiece buy 3 get 2 free, energizer lithium, $6.50 apiece in town.
Definitely worth it for me to see the exact pressure.
They have been working good for me, has a warning light and alarm when a battery is low on sensors.
If anyone pulls trailers and has had a blow out on a trailer and k ow that pain, there are also setups for trailers and trucks and trailers, a booster antenna is added so the monitor can get the data from the senor farther away on trailers.