Best Review Aten US421 4-Port USB 2.0 Peripheral SwitchWith so many available these days, it is good to have a name you can recognise. The Aten US421 4-Port USB 2.0 Peripheral Switch is certainly that and will be a superb purchase. For this reduced price, the Aten US421 4-Port USB 2.0 Peripheral Switch comes widely respected and is a regular choice amongst lots of people.