As long as you don’t find their treble response puts your teeth on edge too badly, there’s really no reason not to give them thorough consideration.

Wide-open; lavishly detailed and informative sound; Fine touch- and app-control; More comfortable than they look

Don’t really look or feel the money’s-worth; Periodically spiky treble; Humdrum battery life

It would be foolish to spend upwards of £100 on an MP3 player and then not bother to upgrade the headphones, and when you do there's a raft of companies vying for your money. Sennheiser has always been strong on the budget headphones front and its latest CX400s - the follow-up to the incredibly...

While slightly compromised in the features department, the CX 400BT are sonic marvels – and, at this price, hugely appealing

Lively; detailed sound; Lightweight fit; Excellent value for money

Battery life below the best; Not waterproof

Great sound quality and I prefer these over my Beats headphones. Sale price was 50 percent off so great value.

These buds need break in, both sound and ear tips. After a few days they really perform, so be patient.

sounds great

They’re not the most glamorous nor the most distinctive – but Sennheiser’s new CX400BT true wireless earbuds have it where it counts. They sound open and articulate, and if there’s detail in a recording to be extracted, you can rely on them to do just that.

Widescreen; detailed; and quite upfront sound; More comfortable to wear than they look; Great app and good touch-control

Can be excitable with treble sounds; Ordinary battery life; Don’t quite look or feel the asking price

My time using the CX 400BT was very enjoyable. I appreciated all the customizable options and warm sound signature, as well as their flawless connection and accessibility. For $199.95 this is a solid true wireless from Sennheiser, and a sure buy if you’re looking for a reliable pair.

The Sennheiser CX 400BT is a compact truly wireless set with a charging case that is easily held in your hands....

The Sennheiser CX 400BT True Wireless earphones are many things but it’s no question they follow one of the German audio company’s hard-to-remember naming conventions.