[The Newell]

System is distributed by Doran and Advantage. Same system, two different distributors.
I have heard good things about customer service from both.

I had the system with 10 monitors. The system is wireless and works great. I have found it to be very accurate.

They say the batteries last about three years. Longer if you take them off and they are not in use for periods of time. If you do remove them make sure you put them back on the same wheel they came off of. You do have to return them to the manufacturer for new batteries. Last I heard cost was about $15 plus you get the latest upgrades. They won't all go out at the same time so it isn't like you have to buy a new system every three years.

Installation was easy. Well except for one minor error (installer malfunction) and a call to customer service got me someone on the phone right a way and they identified what I had done wrong and all was taken care of right then on the phone. No problems since.

I would highly recommend this product.