The obvious difference in size between iStick 20 and iStick Mini

Eleaf iStick Mini is a relatively tiny one over iStick 20W. But it still can have a power output up to 10W. The tiny size is especially suitable as a pocket friendly device.

Specification of iStick mini 10w:

Size: 21 mm * 32.5mm * 52mm
Color: black, silver, red, blue
Capacity: 1050mAh
Voltage: 3.3V-5.0V
Wattage: 10W max
Thread Type: 510 Thread

Specification of iStick 20w:

Size: 75mm*21mm*32.8mm
Color: black, silver, red, blue
Capacity: 2200mAh
Thread Type: 510 Thread
Variable voltage: 3.0V - 5.5V
Variable wattage: 2.0W - 20W

From the below picture, you can notice the obvious difference between them. The bigger or smaller one, you can make your choice.