State of the art dynamo 4 in 1 flashlight with 3 bright LEDs, Am/Fm radio, emergency siren, and cell phone charging capabilities with an adapter. The high efficiency dynamo system allows one minute of winding to create enough power for 1 LED to last an hour and a half or 3 LEDs to last for 30 minutes. Winding for 3 minutes will give your cell phone 2-8 minutes of talk time. Great tool for every home, automobile, RV, boat, office, and school. Never needs batteries. Dimensions: 7.5" x 2.3" x 2.3"