In the speaker test, the best Bluetooth and WiFi devices score highly with their rich sound and ease of use. However, only a few offer this complete package. Natural sounding bass, clearly audible details and balanced, lively sound - this is what the perfect speaker should sound like...

The JBL Go 4 is one of the smallest Bluetooth speakers on the market, packed with functions and very robust. The sound is what you'd expect: flat and bland, but given the dimensions, it's still fine for those who want to listen at a lower volume. If you can spend a little more, you should opt for the Clip 5. It's slightly larger, but offers a much better sound.

If you are looking for a good-sounding Bluetooth speaker in a pocket-sized format, the JBL Go 4 is a guaranteed find. The small speaker has an appealing design, is extremely robust (and waterproof) and sounds well above its size - but you shouldn't expect miracles. Larger speakers sound far better...

The Go 4 from JBL is the smallest and cheapest of those tested, and it shows. The sound is tinny, voices are sometimes croaky and there is virtually no trace of bass. The lightest Bluetooth speaker in the test fails above all in terms of battery life: in several runs, it only lasted for 3.5 hours each and thus only for very short trips...