SMARTA - the Smarttech brush in a pack of 4 For all the small outlets and outlets on smartphones, headphones, headphone cases and laptops. Because dust, dirt, etc. like to accumulate here quickly and easily, but so far there is no suitable cleaning option. If you don't want to handle fingers, cotton swabs or toothpicks anymore, you absolutely need SMARTA. And we've added one more: SMARTA fits every keychain and is therefore always at hand when dirt gets out of hand.