The NodeMcu is an open-source firmware and development kit that helps you to prototype your IoT product within a few Lua script lines.
Features:

1. low-cost WiFi solution programmable with the Lua scripting language
2. on-board USB-serial adaptor
3. PCB antenna (no external antenna required)
4. 10 GPIO pins, each GPIO can be PWM, I2C, 1-wire
5. breadboard compatible
6. powered via microB USB

Specifications:

1. chipset: ESP8266
2. general purpose IO: GPIO 10
3. operating voltage: 5 VDC (USB)
4. dimensions: 5.8 x 3.2 x 1.2 cm
5. weight: 12 g

vma107_a4v02.pdf

1739007-wpb107_ce_ukca_reach_2.pdf