The AK-RK01SY uses a standard dongle, but they are hard to replace. You can use the keyboard exclusively via Bluetooth or Wired mode. Contact the seller for a replacement dongle (search "AK-RK01SY receiver").
Be cautious of third-party "manual download" websites that require an email address or payment. The AK-RK01SY manual is free. ak-rk01sy manual
Программирование радиореле AK RK01SY The AK-RK01SY uses a standard dongle, but they
While this article covers everything, some users want the original file. Here is how to find the official : The AK-RK01SY uses a standard dongle