... BV, GMC Solar Dynamo,Crank Digital Display,Radio AM FM,Dynamo Digital Display Radio AM/FM (SB-5020B) Function & Features: 1.Cranking ... (optional) 4.Digital display of frequency, 2 band: FM/AM 5.Digital clock, timing power on 6.Charge digital ... timesThe whole unit5 yearsThe plastic part5 yearsOthersSpecification of built-in battery300mAh, 3.6vDiameter of built-in speakerΦ36mm (two)Generator power5W