For such a tiny speaker, measuring only 7 cm x 3 cm, the Polk BOOM is a pretty powerful one.
It’s a wearable, portable, Bluetooth speaker you can use for all your activities, be it running, cycling or other outdoor activity. It’s sturdy, resisting to impact,sweat and sand and it’s easily clipped to an item of clothing, a backpack or helmet. Battery life will allow you 3 h of listening time.
With an accessible price, it’s available in a choice of fun colours.

£29.99 Polk BOOM BIT