From the manufacturer: Rated at IP44 for water-proof level, the Kaito KA-220 is a self-powered rechargeable AM/FM radio suitable for bathroom use or at places where high humidity is present. At the heart of the KA-220, there is a dynamo generator that recharges the internal rechargeable Ni-MH battery pack and powers the radio. In addition, the radio features a 5V input jack for charging its internal battery via a computer, USB charging cable is included. With its revolutionary design and versatile functions, it"s not only an ideal choice of a portable bathroom radio but also a value tool for emergency preparedness purposes, travelling, camping, backpacking and other outdoor activities. Specifications: FM: 87 - 108 MHz AM: 520 -1620 KHz Internal speaker Headset jack socket: 3.5 mm 5V DC IN Rechargeable batteries: 2.4V Ni-MH batteries 300mAh Dimensions: 5 X 2 ¾ X 1 ½ inches Weight: 8 oz What"s in the box: KA-220 AM/FM radio USB charging cable (for charging internal battery via a computer) User manual