The Sennheiser CX 400BT True Wireless earbuds have an understated design but pack 7mm full range dynamic drivers for the detailed and wide sound that belies its modest looks. Add in a light build and comfy ear tips for comfortable extended wear when working from home or on the go and you have an...

With its third set of true wireless earbuds, Sennheiser’s CX 400BT is a more affordable option. The company manages to mostly retain the stellar sound quality from the Momentum True Wireless 2 along with customizable and reliable touch controls.

Great sound; Customizable controls; Configurable EQ

No ANC; No ambient sound; No automatic pausing; No wireless charging

A battery that just doesn't give in

Sennheiser’s first true wireless headphones outside the Momentum range offer the same superb sound quality without such a steep price tag

Superb sound quality; Stable connection; Quick; seamless pairing

No splash proofing; No ANC; Not cheap

The Sennheiser CX 400BT earphones deliver some of the best on-ear controls and audio performance you'll find in a true wireless pair.

Excellent audio performance with rich bass depth and detailed highs; Comprehensive; intuitive; and customizable on-ear controls; App features adjustable EQ; Secure fit

Pricey; Not ideal for gym use

Sennheiser’s first true wireless headphones outside the Momentum range offer the same superb sound quality without such a steep price tag

Superb sound quality; Stable connection; Quick, seamless pairing;

No splash proofing; No ANC; Not cheap;

Sennheiser’s first true wireless headphones outside the Momentum range offer the same superb sound quality without such a steep price tag

Superb sound quality; Stable connection; Quick, seamless pairing;

No splash proofing; No ANC; Not cheap;

The first pair of standalone earbuds I bought was the Sennheiser CX 400-II . It was 2009 and at the time, it seemed preposterous to spend money on an accessory that was bundled for free with every phone or iPod.

Sound These are the best-sounding true wireless buds I've tried; Controls They're customizable in the app, and give neat feedback through different tones for double and triple taps; App You can customize the equalizer and easily switch your buds' connection between multiple phones and computers.

No independence The right earbud is the master. You can't use the left one alone as only the right one works in mono mode; Missing features Besides the lack of ANC, these don't have proximity sensors, a transparency mode, wireless charging, or an IP rating of any kind.

Good quality easy set-up very happy

The Sennheiser CX 400BT is a really solid mid-range set of TWS earphones, but bargain hunters may want to find something else if ANC is important to them. Still, having high-end audio hardware at a mid-range price point is a good bargain in our opinion.

Sound quality; In-app equalizer; Small case; USB-C charging; AAC and aptX support

Cost; No ANC; Large earbuds