I'm a big fan of all Furrtek's work, especially these replacement parts, it's great to have someone supporting repair of the original boards. Hopefully there will be a NEO-C1 replacement in future as I have a dead board waiting ;)
Well designed PCB , correct spacing for power traces even if you are sticking a pcb in a USB port. Avoids mis insertion and usb errors. Power circuit for a rechargeable coin Li cell. Pre programmed IC which I didn't expect. Up loadable payload via serial, blasts it at a press of a button.