Bests & Worsts Reviews from Amazon

These clones, while faithful to the schematic use a part which is not obeying the voltage limit rules required for the Atmega on the device. Zero out of the three samples in my batch worked. I observed that when trying to program a sketch an RX light would turn on, but the TX lights stayed off. Attaching scope probes to the RST, RXD, and TXD lines revealed the cause. The USB to serial converter is receiving commands and trying to send them to the Atmega, but the logic levels are out of specification so to the Atemga nothing is coming in. Subsequently programming sketches is not possible. Until this is rectified I recommend avoiding purchase. Please see attached scope capture as evidence.