Twenty feet -- that's six meters. Other suggestions include putting more distance between you and the device and using good lighting.

VOA: special.2011.08.01

If a heart beats too slowly, the device will use electrical signals to help set a normal rate.

VOA: special.2010.06.29

These collect rainwater. But the device is designed to collect water even when there is no rain.

VOA: special.2010.07.13

The device made it possible to strengthen radio signals and to send them over long distances.

VOA: special.2010.01.31

She remembers that the man operating the device at first refused to accept her material.

VOA: special.2010.02.09

A computer mouse is the device that moves the pointer,or cursor, on a computer screen.

VOA: special.2010.03.28

They said close to ninety percent of the trees planted with the device survived.

VOA: special.2010.07.13

The device sends a signal to a computer at the back of the car.

VOA: special.2009.11.03

The device used to weave together warp and weft threads is called a loom.

VOA: special.2009.11.04

"Well,when you see the device, what comes to mind immediately is that you have a whole lot of desire but not a whole lot of technical ability."

VOA: special.2010.05.08

The device shows scientists what an object is made of from great distances.

VOA: special.2009.12.30

Companies that produce the devices usually provide directions about using the device correctly.

VOA: special.2010.02.02

The device can download books wirelessly from a store on Amazon's Web site.

VOA: special.2009.07.24

The company that makes the device,Medtronic,helped to pay for the study.

VOA: special.2009.02.03