Dynamo Radio plus 5-LED light never needs batteries -- power comes from winding. Just a one minute of winding provides 30 minutes of continuous lighting or AM/FM radio. Dial radio tuning for finding even faint stations. Four Ways to Power Up: wind-up generator – rechargeable NiMh battery – rechargeable with 12V DC Input (included) & 12V AC/DC adaptor. Recharges cell phones (cell phone adaptor kit included).