Loved mine until I lost the transmitter. Used it to control kodi from across the room. Now I am just using an app remote.
Lost mine also. The keyboard was used for my tv connected PC. Bought a stand-alone receiver for less than $13 to replace it. Cheaper than buying a new one. Logitech USB Unifying Receiver https://www.amazon.com/dp/B072JW9LT8/ref=cm_sw_r_cp_api_i_p8vsEbAY9ZVS8
Although I ended up buying another keyboard to use for projects. 