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The electromagnetic charge flashlight is new product in market. When flashlight's built-in batteris low, you can recharge it as shaking the magetic core up & down pass through the coil to generate electric current for furnish built-in batteries. The total length of flashlight is 18cm. Light source is 0.28W high lumen 10mm dia LED. 120 Lux or Lumen per square meter luminosity output. Good for vehicle owners, housekeepers, travellers, etc.