Whether you can't have your phone's ringtone on (eg at work) or you're in a noisy place (eg Train or Nightclub) so you can't hear your phone, these brilliant Mathmos light charms are the ideal accessory to prevent you missing important phone calls. They sense when a call is being received and flash to alert you.

Available as either a mini lava lamp shape (very retro) or super cool light bulb design, they are fantastically well made. They're not only extremely practical but will make you look cool too.

The Mathmos Astro Light Charms comes with a striking red LED or with a Red/Blue LED, and the light bulb design has a white flash. All models are approx 3cm tall and come with batteries included.