This product is not subject to discounts. Features: Easy design, just change the sub-board. Other products make you wonder where to put the jumper wires. This one eliminates that, so even electronic hobbyists can easily just point to the bundled jumper wires without hesitation. Anyone can replace it with just a soldering iron & file. Stereoization with a built-in 3D sound audio processor. Can be used with a normal operating voltage of 7V to 9V, regardless of polarity. Can use the Famicom's original AC adapter. ＜When replaced＞ Vertical stripe noise countermeasures Clearer video Stereo AV terminal TV connection possible Operation lamp lights up ＜Set Contents＞ Sub-board AV cable (approx. 3m) Installation manual A sure way to distinguish between the early and late models: Early models have the main power switch lead coming from the sub-board. Late models have the main power switch lead coming from the main board. If you have any questions, please ask in the comments.