... Specification sound box amplifier: 1.3.5mm Audio cable 2.USB cable 3.FM radio, earphone function Features:sound box amplifier ... ,iPhone&iPhone 3G&4 can be charged when playing by plug in straightly.Plays audio from iPod, iPhone, iPad, computer, ... built in amp powered by rechargeable batteryIncludes speaker cable with USB plug for charging speakersVacuum bass design for enhanced low frequency response ...