A cool breeze offers welcome relief in hot weather, but fans are so noisy and bulky. This mini fan surprised us all, its blades whipping up a storm despite its diminutive size. This is due to cleverly engineered blades designed to maximise air flow. It has 3 power levels, including a virtually silent setting ideal for the bedside on hot summer nights. It runs for up to 8 hours on a single charge (via USB) and weighs just 200g, so you can use it just about anywhere. Power it via your PC, laptop or mains USB socket.