The HD 4.50 BTNCs are significantly cheaper than noise-cancelling headphones from Bose and Sony designed for business travellers, while Sennhesier's NoiseGuard tech proves almost as effective. Thrown in a travel-friendly design and these wireless Bluetooth headphones are hard to argue with.

Great noise cancelling; 20-hour battery; Travel-friendly design; Surprisingly affordable

NoiseGuard tricky to activate; Headband lacks padding; Ear-cups lack ventilation

The Sennheiser HD 4.50 BTNC offer a nice design, are reasonably comfortable, and sound great. Sure, there are better noise cancelling headphones out there - like the Bose QuietComfort 35 headphones.

Not everybody can afford a premium wireless noise-canceling headphone, which is where Sennheiser's more budget-conscious HD 4.50 BTNC Wireless comes in. At $200 (£170, $AU329), it's not cheap, but it's less than what you'll pay for certain models from Sony and Bose -- and Sennheiser, too.

The Sennheiser HD 4.50 BTNC Wireless is wireless noise-canceling headphone with effective noise canceling that sounds great and costs significantly less than Bose's QuietComfort 35; It works well as a headset and offers decent battery life; The headphones fold up into a simple canvas carrying bag

Not quite as comfortable as higher-end models from Bose; Sony and Sennheiser

Great sound, as one would expect from Sennheiser. Ample bass from the drivers. The earcups are comfortable but their oval shape gives a little bit of an on-ear feel than I would have liked. If I fit them perfectly over my ears then I get the over-ear feel and comfort.

These allow you to run them with the cord if the battery dies. That's a handy function! --Noise cancelling is sufficient. Once you make it to the Bose, Sennheiser, JBL group of cans, the playing field is more about preference.

Active noise cancelling Low price Good sound quality

2.5mm cord on the can side, 3.5mm on the phone side; Use the same size on both sides! 3mm on a 40mm thick can is a drop in the bucket

Sound 5/5 Battery 5/5 Microphone 2/5 I use those headphones 8-10 hours 5 days a week sound quality is amazing, battery very good, few minuses ears gets sore when I used them for too long also head a bit sore from a headband, apart from that great product for the price.

This is my first pair of over the ear headphones so my thoughts after a week. Battery life - Excellent Sound quality - Good I listen to a range of genres for Hip Hop and R&B songs with a lot of deep base these are excellent the only down side is that they aren't very load.

I read many reviews about many headphones before I settled on purchasing these for my Husband's Birthday present. He is extremely pleased with them and finds wearing them comfortable and the sound very clear. I have never purchased headphones before. They have lived up to our expectations.

I have been using these headphones for a couple of weeks now. As you would expect from Sennheiser the sound quality is excellent and the noise cancelling works well, both on its own and when listening to music, cancelling out most of the engine noise on the train and bus.

Comfortable to wear except they get a bit sweaty if exercising. Noise reduction is good but not great. If is hard to tell if the noise reduction is on or off. The blinking light is the same for both. You have to try them on each setting to tell whether it is on.