Poboljšana verzija ESP-01 modula
ESP8266 microcontroler čip

Specifikacija: 1 jezgra
32-bit
CPU clock speed: 80 MHz – 160 MHz
Memory: External flash memory chip
Flash memory: 512 KB – 1 MB
Operating voltage (logic level): 3.6V DC (max)
Input voltage: 2.5 – 3.6V DC
Power source: GPIO pins (Vc & CH_PD – both need to be connected) Networking: Wi-Fi (IEEE 802.11 b/g/n)
Antenna: On-board PCB trace
Standards: FCC/CE/TELEC/SRRC

Frequency range: 2.4G ~ 2.5G (2400 m ~ 2483.5 m)
Tx power: 802.11 b: +20 dBm, 802.11 g: +17 dBm, 802.11 n: +14 dBm
Rx sensitivity: 802.11 b: -91 dbm (11 Mbps), 802.11 g: -75 dbm (54 Mbps), 802.11 n: -72 dbm (MCS7)
Security modes: WPA, WPA2
Encryption: WEP/TKIP/AES

Network protocols: IPv4, TCP/UDP/HTTP/FTP
Digital I/O (read/write) pins: 2 (GPIO0 & GPIO2)
On-board LED pin: GPIO1 (also doubles as Tx pin)
Size: 25x14.5 mm
Operating current per I/O pin: 12 mA