IMPORTANT INFORMATION : ALLTRONIK S 501 B1 has been replaced with a new and highly compatible remote control (without mini switches) Your original remote control must be in good working order to make the copy!
Check the frequency on the quartz. This very model exists also in 27.0145 MHZ ( Obsolete), 27.015 MHZ, 40.685 MHz. Check the LED colour : green LED = 27 Mhz, red LED = 40 Mhz.
Compatible wIth ALLTRONIK S206, S205, S215, S235, S236, S405B, S415B, S435B, S436B and S270.