Pimm’s, strawberries and the All England Club might seem like a long way away right now – but if you’re jonesing for a taste of Wimbledon in the winter, these Bluetooth speakers are made from tennis balls used at last year’s tournament. The 500mAh battery is charged via the included dock; and while the 3W of audio power isn’t likely to get the umpire appealing for quiet, you can play doubles by adding a second speaker for stereo sound, with pairs available for £99. Just don’t try taking one of these down to your local courts for a quick game – it won’t like it, and you’ll end up having to sing the hits of Cliff Richard to yourself instead.