If you en.wikipedia.org/wiki/Electronics - passive sound - love music you love headphones too at least you should. Headphones can do one thing, they allow you to listen to all of your music in your own world, without disturbing others. They have been used for many many years. If you go to the mall or even work, chances are, you'll see someone wearing them, even when they're not supposed to. You can use them with your iPods, MP3 players, home stereos, portable CD players and all other audio devices with headphone inputs. They also come in a variety of colors and designs to match your style and needs. There's quite a variety of headphones to choose from and here are some fine examples, below.PNR - " independentmarketplace.co.uk/how-do-passive-noise-cancelling-headphones-work/ - passive noise canelling headset - Reduction" style headsets protect hearing by covering the ears and forming a seal against external noises. Much like hearing protectors - which is what they are at the most basic level - they buffer your ears from loud sounds and decrease the noise level that you hear. All headsets are passive in one way or another. Certain features of a unit can help or hurt the amount of passive noise reduction it provides. If the frame doesn't fit properly, it can allow extra sound through the ear seal, and reduce the noise reduction.The petrol strimmer when in full flow can be a loud and noisy little creature and constant exposure to this noise at close proximity can damage your eardrum. So when you buy the strimmer remember that you need to protect those precious senses, sight and hearing, of yours. Invest in a decent pair of eye goggles and some ear plugs or ear defenders then you should be fine.You need a phone that will work anywhere on the planet. The BlackBerry passive noise cancelling headset Curve will work wherever you travel. It has GPS and Blackberry map capabilities to find where you are going in an unfamiliar place or just to find the nearest restaurant for that quick business meeting. This has a full qwerty keyboard and wi-fi so you can send an email to anyone anywhere you are. Price varies by plan, usually around $200.I try to leave enough room for some duty free goodies. I am a smoker and take advantage of the tax free cigarettes. I take a risk buying three or six cartons depending on the length of my trip. The risk is that most countries only allow you to bring in one carton. I still haven't figured out this rule since most duty free shops sell the cigarette cartons in 2 or 3 packs or have a buy one get one special. I have never been stopped by the customs officers but I do keep the duty free bag out of site in my backpack.Sometimes you leave something behind or your luggage takes a trip somewhere else thanks to the airline, don't worry you can be reunited if you put Stuffbaks semi permanent global ID tags on all your important things. A StuffBak Recovery Tag System starter kit costs $27.95.