Bluetooth, AUX input and headphone output are OK. I can't switch between stereo and mono. It seems to be a bonus function. There are no noticeable scratches or damages on the exterior.There is no rust on the terminals of the battery compartment, but there is dirt due to liquid leakage. With dedicated remote control and stereo mini plug cable. Please feel free to ask me if you have any questions. We also list many other rare items. International Buyers - Please Note. The item "BOOM BOX FIFTY Bluetooth speaker DS -999 with remote control ROCKBEATS" is in sale since Monday, February 8, 2021. This item is in the category "Consumer Electronics\Portable Audio & Headphones\Portable Stereos & Boomboxes". The seller is "tamashiro" and is located in nukata. This item can be shipped worldwide.