I have been looking for an affordable option for remote id compliance for my Typhoon H. I recently came across a module marketed by Holy Stone. It is self powered (lithium battery), has internal antenna and is very light with a small footprint. I ordered one from Amazon and received it quickly. I downloaded their app to put my information in the module database. I can now see it transmitting in Air Sentinel. If you are looking to comply, this is one of the cheaper units and it functions as it should. I am not promoting this for any business (not an affiliate link) and paid for the module out of my pocket.