Details:
 
1. Price include:
1pcs pen
1pcs USB line
 
2. Japanese motor
Motor: 4 W
Material: Aircraft aluminum
Frequency: 0-11000RPM
Working volt: 4-12V DC
Stroke: 3.5mm
Charging voltage: 5V/1A
Charging time: 3 hours
Usege time: 5-8 hours