Vibration Functions Preheating to Ensure Best Usage Adjustable Voltage: 3.4V/3.6V/3.8V/4.0V Large Capacity And Durability Intelligent LED Indicator

Multi-Functional Vibration Adjustable Voltage: 3.4V/3.6V/3.8V/4.0V Large Capacity And Durability Intelligent LED Indicator USB Rechargeable Battery