Here are a few really useful features - check your model has them before you buy.

There are useful features within the online service that you may find helpful too.

Let me know if you find this a useful feature.

A heart rate monitor is another useful feature to look out for.

What we need is more control for the user to make this into a useful feature.

So maybe document editing and other more useful features are coming.

Each has interesting and useful features not found on the other.

One useful feature this telephone has that our old phone didn't have is memory.

The cards never leave the owner's hand, a useful feature.

Another useful feature both search sites offered was the ability to save results.