If you're primarily pruning pesky branches and removing low-hanging tree limbs, then you'll want a pole saw. Essentially, it's a miniature chain saw on an extendable shaft.
A pole saw provides you the safest way of trimming hard to reach tree branches. You can extend the pole up to 15 feet so you don't have to cut from a rickety ladder. These saws are small and are not meant to take on large jobs.