name: black knight
Function : 10 vibration frequencies + 10 beating frequencies
Colour : Black
Material : Silicone + ABS
Charging mode : USB pinhole charging method
Charging time : 120 minutes
Voltage : 3.7V
Battery life : 60-90 minutes (related to the vibration frequency used)
Waterproof grade : life waterproof
Warranty period : 6 months
Sound shell : < 50 decibels
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