Hello WakeMate Customer,
We have just been alerted to a safety issue with our product. The black USB charger bricks that have been included with the product are defective. Do not use them.
The USB chargers were sourced through a Chinese vendor. We paid to have the proper certification and safety tests performed here in the U.S. for the chargers. However, tonight we were informed by a customer of a safety incident with the black USB chargers. Therefore, effective immediately we are recalling ALL USB charger bricks and informing our customers that it is not safe to use these USB chargers to charge your WakeMate.
We will continue to look into the situation but needed to email you immediately to ensure that you stop using and unplug the included Black USB Power Bricks.
We are extremely sorry that we sent a product containing defective components. However, we also want to stress that this issue is with the chargers only, and not with the WakeMate itself. It is still safe to use the included USB cable to charge the WakeMate, and it is safe to wear the WakeMate while sleeping.
I sincerely apologize for this mishap on our part. We are doing everything we can to prevent any further incidents with the USB charger bricks.
If you have any questions do not hesitate to contact me.
Sincerely,
Arun Gupta
CEO, Perfect Third Inc.
While the notice is specific about what exactly is defective, there are reports out there that units are catching on fire. For example, Jason Toff, a Googler, sent out this tweet tonight:
WARNING: my @WakeMate just burnt into flames, nearly catching my bed on fire. Do NOT use. Video of it afterward: https://twitvid.com/UBBWC
He followed up to say he was fine, but that he was lucky he was around or his home would be on fire right now.

Authors: MG Siegler