I just don't ever use it. I bought it to begin with just to test it to see if they are worth buying in bulk to sell locally. However, I don't think I can sell them for more than I paid for this unit ($120+ $29 shipping)If you're in the US and would like a unit sooner than you could get it from China this is definitely the best option. The device is still in perfect working order. It's in the same condition as it was when it was new.