Crank Dynamo Walkie Talkie / Interphone. DoLink owns the patent of this item worldwide; Imitation is illegal !!! Crank Dynamo Walkie Talkie / InterphoneProduct Introduction:a.Fantastic / novel / smart designed, excellent to the feel,b.With strong practicability, applicable for both housing and traveling use.c.Environmental friendly, no dry batteries needed. With delicate configuration and high ...