Hello, good evening. Thank you for looking! This is the GA320SA remote control for SHARP HDD/DVD recorders. I can't confirm whether any signals are being sent, let alone whether all the buttons work, as I likely no longer have a machine that can receive them. Also, as it's an old item, I won't be checking it with a smartphone. Regarding cleaning, I've only wiped it down briefly with a wet wipe. I haven't gone to the trouble of cleaning the gaps between the buttons, etc. Please research the compatible models yourself. This is a junk item, and I will not accept returns or refunds for any reason, including if it's incompatible. Please only purchase this if you can accept that it's junk and understand that anything could be wrong with it. As you can see in the photos, there is discoloration. The battery compartment was clean. I plan to wrap it once in bubble wrap and send it in a plastic bag with a Yu-Packet Post sticker attached. Thank you for reading this far!