Since some remote controls have a sticker model on the back, and some do not, they cannot be directly viewed from the remote control. The remote control is mainly determined by the chip model and crystal frequency, we can remove the shell and see the chip model.
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Take apart a remote control, and it's a circuit board and a battery.
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The main chip models are: 1527, 2240, 2260, 2262, 2264, FP527, SMC918, etc.
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Crystal frequency: 310, 315, 330, 350, 390, 418, 430, 433 and so on