Update on my prior review titled poor quality control - Mantis Blackbeard the Auto-Resetting Trigger System for AR-15

After emailing Mantis, they sent me troubleshooting questionnaire. This helped me diagnose the problem as a faulty USB cable that was included in the kit. It would have been helpful if the sparse instructions included with the kit were a little more complete. Knowing that 3 LEDs was a half charged battery, and that a full battery showed 5 LEDs might have helped diagnose a problem with the USB cable before contacting Mantis. The unit works well, and fulfills its intended role as a tool to help me dry fire more.