All information concerning your replaced product (Remote control DELTRON S521 40.685 MHZ) :
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Product description and characteristics
S521 40.685 MHZ
Remotes with the same frequency are not compatible, if the shape, the color of keys, color of the box is different. This applies even if they are from the same brand. They do not have the same electronics!
Please note: please open up the remote control and verify that the frequency written on the quartz inside is 40.685 MHz. If your remote control has a frequency of 27.015 MHz, then there is no replacement for it. You will need to install an upgrade kit. Please do not confuse this model with the identical model from Ecostar (written on the front of the fob). They are not compatible.