Here you can purchase a M4 Beta unit for an reduced price. This is the chance to get hold of the M4s before mass production starts.
The units from the beta phase have a hardware were we needed to bend things a bit. Two diodes and one resistor have been added manually. Also we glued four lightpipes in order to improve brightness. This has no impact on the functionality.
For using the M4 you need a beta firmware for the Droid. You´ll find that on Discord in the #droid-m4 channel.