The memory chip is an W25Q80BVSSIG which digikey and others show as an 8MBIT (or 1 M byte) flash chip.
So will it work with the latest version of espbasic??
ESP_Basic Driving Lessons - Chapter 8
This project was developed around the readily available Sonoff relay module, which in the absence of any info to the contrary is assumed to be a 512K device and therefore unsuitable for ESP_Basic 3. - See more at: viewtopic.php?f=40&t=9868&start=4#sthash.gRDGIfVL.dpuf
and how can I identify if my module has gpio14??
If you have the later version Sonoff with gpio14, or a home-brew module with a spare gpio, you can use the spare gpio as input for a DHT temperature and humidity sensor.
thanks in advance