The Philips Avent SCD498 Baby Monitor can reach as far as 300 meter in open field or 50 meters in houses. It has signals to notify you when the connection is lost. I never had problems using it. Find its manual / user instruction in PDF below.
In the world of baby and children chairs there is only one option. The Stokke Tripp Trapp is a wooden chair designed already in the 70’s. These chairs enable the child to move its arms freely, and to rest its feet. It’s highly adaptable to the size of a growing child and can be used from 0 to adult. The 150 euro’s or so seem quite a lot of money but be sure it’s a decent investments for years.