How to make a loudspeaker from a balloon

Technology Will Save Us DIY speaker kit: Discover how you can turn a simple balloon or a painted cardboard box into a portable speaker and plug it into your smartphone or tablet to play your favourite tunes.
Technology Will Save Us DIY Speaker KitTechnology Will Save Us DIY Speaker Kit
Technology Will Save Us DIY Speaker Kit

You will also need wire clippers, a soldering iron, 9V battery and around two hours of spare time. £26, johnlewis.com

ELECTRONIC LAB 101 KIT: This compact, portable electronic kit contains instructions and reusable components to make eight separate projects ranging from lighting an LED to building a biscuit jar alarm. Suitable for ages 14-plus. £23, notonthehighstreet.com