Name of product series: Wonopro Universal Safety Travel Adapter w/dual voltage indicator & surge protector series Name of socket: Wonopro Universal Safety Travel Adapter w/dual voltage indicator & surge protector Socket Material: * made of ABS fireproof * High-grade copper of metal parts Socket Functions: 1. Patented safety shutter has a unique function of double-on-and-off 2. Universal receptacle can accept different plugs all over the world. 3. (V) with 110V & 220V voltage indicator 4. (S) with lightning surge protector 5.22 kinds of plugs, including all plugs all over the world, can be optional