Monster 123872-00 iSplitter Shared Headphone Adapter (Discontinued by Manufacturer) Connects two sets of headphones to iPhone, iPod, MP3 player, laptop, portable CD/DVD/game system, and SmartPhone Plugs into any standard 1/8" (3.5mm) mini-headphone jack. Dual volume controls enable individual listening levels. Built-in mute switch allows quick breaks without interrupting other listener or pausing device. Rugged, compact construction ideal for travel and on-the-go use.