Booster seats work in conjunction with your seat belts, they have no separate harness. Again the idea is to boost your child up so that he or she can safely wear the belts. Boosters are designed for kids 30 to 100 pounds and up to 57 inches high.
No matter which type of car seat you buy it is very important to follow the manufacturer's guidelines for fitting and relating to the size of the child. Some manufacturers such as Britax provide videos showing how to install their seats and this is usually a real time saver as well as ensuring that you use the seat safely.
However, you will still have to worry about how hard it is to detach such a harness. Go for baby car seats that allow for maximum safety and easiest securing of children. Also try reading the manual for each baby car seat to find out the guidelines and functionality each one offers. This will give a better idea on comparing each baby car seat by make and function.
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