Hello, good evening. Thank you for viewing! This is the GA320SA remote control for SHARP HDD/DVD recorders. Since there's likely no machine available to receive the signal, I haven't been able to confirm whether any signals are being emitted, let alone test all the buttons. Also, as it's an old item, I haven't checked it using 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 thoroughly. Please research the compatible models yourself. This is a junk item, and I will not accept returns or refunds for any reason, including incompatibility. Please only purchase if you can accept any issues, as it is junk. 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 vinyl bag with a Yu-Packet Post sticker attached. Thank you for reading this far!