A: no button
Name: All-plastic pen grinder
Size: 2.8*13.8cm
Material: ABS
Input voltage: 100V-240W
Power supply method: USB/socket power supply
Weight: 105g
Frequency: 50-60HZ
Speed: 3000-20000 (adjustable)
Note: The plastic head is easy to fall out during use.
B: Button
Name: Silver-headed pen grinder
Size: 2*15.8cm
Material: ABS
Input voltage: 100V-240W
Power supply method: USB/socket power supply
Weight: 300g
Frequency: 50-60HZ
Speed: 3000-20000 (adjustable)
The chuck of the button is metal, which can tighten the grinding head, and it is not easy to fall out during use.