A simple piece of kit, the lens blower is a simple, non-contact solution for removing any dust specs from lenses, or more importantly, camera sensors.
When using it to clean a sensor, hold the camera with the camera opening facing the floor, this ensures that any dust specs that are removed will fall to the floor instead of settling back on to the sensor.
A blower is included with each camera that features an interchangable lens system and these are especially important on teh Mirrorless cameras that can attract dust on lens changes with no mirror to protect the sensor