3. Rukus solar-powered Bluetooth sound system

If you like your audio tech with serious eco-friendly credentials, Rukus has come up with this wireless streaming set-up that charges up using a 40-inch monocrystal solar panel so you can listen to your tunes all day. Connecting to your device via Bluetooth, the E-ink display means you can preserve that sun-soaking battery life.

Price: £149.95 | Link: Eton Corp