It's best to sell it at a discount, and what can't be sold can only be sold as waste. In order to maximize the benefits, it can be dismantled and sold separately;
Sell, this is the most commonly used method, the instrument has a life, and most of it is still sold as waste;
In fact, the old instruments can be compared or disassembled to make some minor improvements;
If only there were recycled ones, but it would cost a lot of money;