he Genosys Vibrating .50 mm Derma Roller will achieve the best possible penetration of your actives. The vibrating roller detracts from the needling sensation making it much easier to tolerate even if your skin is very sensitive. The roller comes with a .50 mm derma roller with 570 micro needles. 

Features

• 540 Needles (50 needles x 9 disks)
• 2mm diameter
• Special designed disk shaped needle
• Made by Genosys, South Korea

Benefits:

• Shorter recovery, less erythema or redness
• No glue, safer to use
• No needle drop out while needling
• Less painful than other roller devices
• Creates more micro channels. Devise with 192 needles require almost 3 rolls to achieve the same number of micro channels and 1 roll with the Genosys roller.

Heads detach and are replaceable which allows you to replace micro needles without having to replace the entire unit. 

To remove entire head - grabs sides of the head where they connect to the roller and pull straight out. 

To remove the cover - lift the cover upward 
Runs on 2 AAA batteries, not included.

Instructional Video

The Concise Guide Dermal Needling Expanded Medical by Dr. Lance Setterfield, MD is a great book to gain a better understanding of mironeedling and how to achive results.  I highly recommend it.  The best price I have seen is $65.00 free shipping on amazon 

Interview with Dr. Lance Setterfield, MD