Figuring out transmission protocol in cheap wireless door bell
I suspect that a wide pulse is one logic state and a narrow pulse is the other, 25 bits. It could simply be 25 bits of data. Or, a start bit and 3 bytes. I don't see a need to complicate it further.
Some of the bits are probably a serial number, you want to minimize the chance of your neighbor's doorbell interfering. Some of the other bits are a checksum or CRC, you don't want random stuff activating your doorbell.
Unless you get lucky and find something online, you will need data from several devices to have a chance of understanding it further.