Feature:Medical reports have shown mobile phone radiation is dangerous to one’s health. The YUBZ Retro Handset has been certified to be able to reduce mobile phone radiation by a minimum of 96% or even up to 100% for many mobile phones! To use the Retro Handset you will simply plug headphone jack into your headphone output of the mobile device.Equipped with a 3.5mm headphone jack.Compatibility:All Mobiles phones.How to Use:To use the Retro Handset you will simply plug headphone jack into your headphone output of the mobile device. Age Ain''t Nothing But A NumberAge ain''t nothing but a number. Especially when purchasing a YUBZ Retro Handset. YUBZ Retro Handset can be used by both children and adults. It''s all about how you decide to express yourself with the product(s).