doorhan keychain

The doorhan remote control stopped working, there have been no reviews for a long time, a small report
The seller of the link changed the delivery terms, he left me in the same 4.97, but the delivery was aliexpress saver shipping, i.e. with notification.
Buttons are hiding under the retractable pad. Appearance versus doorhan transmitter 2:

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Removed the cover:
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Battery 27A. The key fob is fully working, I registered right away, instructions from the seller:
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I prescribed at the gate:
On the control unit gate press R, on the left segment lights up zero, then press 2 times any button of the key fob, that's all, the key fob is registered.