Since it connects via USB, it can be used in the office, car, or anywhere else. It's a simple on/off operation: plug it in for on, unplug it for off. The size is approximately 42cm square, and it will be lightly rolled up for shipping to fit in an 80-size package. Please be aware of this. The back has a non-slip surface. It doesn't get blazing hot, but rather warms up gently. It consumes little power even with long-term use, making it eco-friendly.