Pen-style are practical electronic sets, distinguished by their tubular shape. They fit perfectly in your hand and can be easily stowed in your pocket. You also don't have to worry about their weight, because you won't feel them in your pocket and, due to their tiny thickness, you'll never have a problem with where to store them.
You can choose from both straightforward ones with built-in, non-adjustable batteries, or ones with an interchangeable external battery with customizable settings.
They're especially great for traveling, but also for frequent carrying. You can simply carry them with you at all times and everywhere.
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Pen-style kits
