Thanks for your reply. Actually, I already tried for my project. I need to get values from different sensors, send it to a server using wifi of the esp8266, and go back to deep sleep mode until next wake up. My project will be powered by a battery (probably Li-ion 18650 3.7V). Right now, it's working fine but the esp8266 V3 is connected via the usb cable. I didn't integrate the deepsleep mode because I didn't have to. I'm working on that independently at the moment. That's why I would need a naked module. Any idea?