Product description Specification: Condition: 100% Brand New Item Type: Negative Ion Hair Growth Comb Material: ABS Product Power Supply: DC 3.7V Medicine Box Capacity: 12ml Power Supply Mode: USB Charging Battery Capacity: 450mAh Charging Time: About 2-3 Hours Vibration Frequency: 6000-8500rpm Usage: Press the on/key to turn on the device. At this time, there will be a micro-vibration massage, and the hair growth liquid will flow out. Comb the entire scalp from front to back, and it is appropriate to use 15 minutes each time; Press the negative ion button, there will be a large amount of negative ion output at this time, and care for the head. Vibration massage and negative ion can be used at the same time. It is best if you feel a little cooling sensation on the scalp when using the hair growth comb (with hair growth liquid). Package List: 1 x Host 1 x Charging Base 1 x USB Cable 1 x Manual Ingredients default