Tried and tested...

“The Braun Silk Expert IPL Hair Removal System promises a reduction in hair after seven weekly sessions, and although it takes a bit of practise, it’s really simple to use and requires no charging.
"Skin must be clean, dry, and fuzz-free (using any method you like) before use, then all you do is take the handheld device, place the sensor on your skin (making sure no light can get through), hold down a button and glide along your skin slowly.